View source for Sima Yi

{{Short description|Chinese general, politician and regent (179–251)}}
{{about|the Cao Wei official of the [[Three Kingdoms]] period and ancestor of the [[Jin dynasty (266–420)|Jin dynasty]]|the emperor of the Eastern Jin dynasty|Emperor Fei of Jin}}
{{family name hatnote|[[Sima (Chinese surname)|Sima]]|lang=Chinese}}
{{very long|date=December 2020|words=15,400}}
{{Use British English|date=March 2022}}
{{Use dmy dates|date=March 2022}}
{{Infobox officeholder
| name = Sima Yi
| native_name = {{normal|司馬懿}}
| image = 魏·太傅 司馬懿.jpg
| image_size = 180px
| caption = A [[Ming dynasty]] illustration of Sima Yi
| office = Grand Tutor ({{langn|zh|太傅}})
| term_start = 13 March 239
| term_end = {{End date|251|09|7|df=yes}}
| monarch = [[Cao Fang]]
| predecessor = [[Zhong Yao]]
| successor = [[Sima Fu]]
| office1 = Manager of the Affairs of the Imperial Secretariat ({{langn|zh|錄尚書事}})
| term_start1 = 22 January
| term_end1 = {{End date|239|03|13|df=yes}}
| monarch1 = Cao Fang
| successor1 = [[Cao Shuang]]
| office2 = [[Palace Attendant]]
| term_start2 = 22 January
| term_end2 = {{End date|239|03|13|df=yes}}
| monarch2 = Cao Fang
| term3 = 221–226
| monarch3 = [[Cao Pi]]
| office4 = Grand Commandant ({{langn|zh|太尉}})
| term_start4 = 13 February 235
| term_end4 = {{End date|239|03|13|df=yes}}
| monarch4 = [[Cao Rui]] / Cao Fang
| predecessor4 = [[Hua Xin]]
| successor4 = [[Man Chong]]
| office5 = General-in-Chief ({{langn|zh|大將軍}})
| term_start5 = 16 March 230
| term_end5 = {{End date|235|02|13|df=yes}}
| monarch5 = Cao Rui
| predecessor5 = [[Cao Zhen]]
| successor5 = [[Cao Yu (Three Kingdoms)|Cao Yu]]
| office6 = Chief Controller of Jing and Yu Provinces ({{langn|zh|荊、豫州牧}})
| term_start6 = July 227
| term_end6 = {{End date|230|03|16|df=yes}}
| monarch6 = Cao Rui
| office7 = General of Agile Cavalry ({{langn|zh|驃騎將軍}})
| term_start7 = January or February 227
| term_end7 = {{End date|230|03|16|df=yes}}
| monarch7 = Cao Rui
| office8 = General Who Pacifies the Army ({{langn|zh|撫軍將軍}})
| term_start8 = {{Start date|224}}
| term_end8 = January or February 227
| monarch8 = [[Cao Pi]] / Cao Rui
| office9 = Right Supervisor of the Imperial Secretariat ({{langn|zh|尚書右僕射}})
| term9 = 221–226
| monarch9 = Cao Pi
| office10 = Palace Assistant Imperial Clerk ({{langn|zh|御史中丞}})
| term10 = 220–221
| monarch10 = Cao Pi
| office11 = Master of Writing ({{langn|zh|尚書}})
| term11 = 220
| monarch11 = Cao Pi
| office12 = Major to the Army of the Chancellor ({{langn|zh|丞相軍司馬}})
| term12 = 219–220
| monarch12 = [[Emperor Xian of Han]]
| chancellor12 = [[Cao Cao]]
| office13 = Master of Records to the Chancellor ({{langn|zh|丞相主簿}})
| term13 = 215–?
| monarch13 = Emperor Xian of Han
| chancellor13 = Cao Cao
| office14 = Senior Clerk for Literary Scholarship ({{langn|zh|文學掾}})
| term14 = 208–?
| monarch14 = Emperor Xian of Han
| chancellor14 = Cao Cao
| birth_date = 179
| birth_place = [[Wen County, Henan|Wen County]], [[Henei Commandery]], <br>[[Han Dynasty]]
| death_date = {{death date and age|251|9|7|179||}}
| death_place = [[Luoyang]], [[Cao Wei]]
| resting_place = [[Mengjin County]], Henan
| father = [[Sima Fang]]
| spouse = [[Zhang Chunhua]]
| partner = {{ubl|Lady Fu|Lady Zhang|Lady Bai}}
| children = {{hlist|[[Sima Shi]]|[[Sima Zhao]]|[[Sima Liang]]|[[Sima Zhou]]|[[Sima Lun]]}}
| relatives = {{unbulleted list|[[Sima Lang]] (brother)|[[Sima Fu]] (brother)|[[Sima Zhi]] (cousin)|{{small|''see also [[Family tree of Sima Yi]]''}}}}
| occupation = Military general, politician, regent
| blank1 = [[Courtesy name]]
| data1 = Zhongda ({{langn|zh|仲達}})
| blank2 = Peerage
| data2 = Marquis of Wuyang ({{langn|zh|舞陽侯}})
| module = {{Infobox royalty | embed=yes
 | posthumous name = Emperor Xuan ({{langn|zh|宣皇帝}})
| temple name = Gaozu ({{langn|zh|高祖}})
 }}
}}
{{Infobox Chinese
| title = Sima Yi
| t = 司馬懿
| s = 司马懿
| p = Sīmǎ Yì
| mi = {{IPAc-cmn|si|1|.|m|a|3|-|yi|4}}
| j = Si<sup>1</sup>-maa<sup>5</sup> Ji<sup>3</sup>
| y = Sī-máh Yi
|w=Ssŭ<sup>1</sup>-ma<sup>3</sup> I<sup>4</sup>
| ci = {{IPAc-yue|s|i|1|.|m|aa|5|-|j|i|3}}
| poj = Si-bé Ì
| mc = sɨ.mˠaX ʔˠiɪH
| altname = [[Courtesy name]]
| t2 = 仲達
| s2 = 仲达
| p2 = Zhòngdá
| mi2 = {{IPAc-cmn|zh|ong|4|.|d|a|2}}
| j2 = Zung<sup>6</sup>-daat<sup>6</sup>
| y2 = Juhng-daaht
| ci2 = {{IPAc-yue|z|ung|6|.|d|aat|6}}
| poj2 = Tiōng-ta̍t
| mc2 = ɖɨuŋH.dɑt̚
}}

'''Sima Yi''' ({{audio|Sima Yi.ogg|pronunciation}}; {{zh|t=司馬懿}}; 179 CE{{snd}}7 September<ref>{{harvnb|Fang|1952}}: "Eighth month. On the day ''[[sexagenary cycle|wu-yin]]'' (Sept. 7), Sima Yi, the Lord Xuan-Wen of Wu-Yang, died."</ref> 251 CE), [[courtesy name]] '''Zhongda''', was a Chinese military general, politician, and [[regent]] of the state of [[Cao Wei]] during the [[Three Kingdoms]] period of China.

He formally began his political career in 208 under the [[Han dynasty|Han dynasty's]] [[Grand chancellor (China)|Imperial Chancellor]] [[Cao Cao]],<ref>{{harvnb|de Crespigny|1996}}: "When Sima Yi was young he was already intelligent, and he had ambitious plans. Cui Yan said to his elder brother Sima Lang, "Your young brother has a clear intelligence and a keen sense of justice, firm decision and exceptional bravery. You are not so good as that!" Cao Cao heard about this and appointed Sima Yi to office, but Sima Yi sought to excuse himself on the grounds that he had rheumatism. Cao Cao was angry and was going to have him arrested. Sima Yi was frightened and took the post."{{pb}}[[Rafe de Crespigny]] notes: "Sima Yi, known by his honorary posthumous title as Emperor Xuan of Jin, was the founder of the imperial fortunes of his family, and destroyer of the Cao dynasty of Wei. There is thus a certain irony in the story that he had to be dragooned by Cao Cao into service; and it may be too good to be true."</ref> and was quickly promoted to higher office. His success in handling domestic and military affairs such as governance and the promotion of agriculture, serving as an adviser, repelling incursions and invasions led by [[Shu Han|Shu]] and [[Eastern Wu|Wu]] forces, speedily defeating [[Meng Da]]'s [[Xincheng Rebellion]], and [[Sima Yi's Liaodong campaign|conquering the Gongsun-led Liaodong commandery]], garnered him great prestige. He is perhaps best known for defending Wei from [[Zhuge Liang's Northern Expeditions|a series of invasions]] that were led by Wei's rival state Shu between 231 and 234.

In 239, along with another co-regent [[Cao Shuang]], he was made to preside as a regent for the young [[Cao Fang]] after the death of latter's adoptive father, [[Cao Rui]]. Although amicable at first, the relationship soon deteriorated in light of Cao Shuang's corruption, extravagance, and attempts to curtail Sima Yi's political influence.{{sfnp|Sima|1084|loc=vol. 74}} In February 249, after carefully planning and building up support, Sima Yi ousted Cao Shuang from power in a [[Incident at the Gaoping Tombs|coup d'état]] and had him and his associates executed.{{sfnp|Sima|1084|loc=vol. 75}}

Afterwards, Sima Yi became the primary authority in Wei, although in June 251 he faced some opposition from [[Wang Ling (Three Kingdoms)|Wang Ling]]'s [[Wang Ling's Rebellion|rebellion]], which he swiftly dealt with. Sima Yi died on 7 September 251, at the age of 71 or 72, and was succeeded by his eldest son [[Sima Shi]].{{sfnp|Sima|1084|loc=vol. 75}}

For the remainder of Wei's history, state power was increasingly vested in the Sima clan, which led to the establishment of the [[Jin dynasty (266–420)|Jin dynasty]], which was founded by Sima Yi's grandson [[Emperor Wu of Jin|Sima Yan]] in February 266. After Sima Yan became emperor, he honoured his grandfather with the posthumous title '''Emperor Xuan of Jin''' and the [[temple name]] '''Gaozu'''. He was also the last common ancestor of all emperors of the Jin dynasty; while emperors of the Western Jin descended from [[Sima Zhao]] (his son with wife [[Zhang Chunhua]]), emperors of the Eastern Jin descended from [[Sima Zhou]] (his son with concubine Lady Fu).

==Family background==
{{see also|Family tree of Sima Yi#Sima Fang and earlier|Sima (Chinese surname)#History}}

Sima Yi's [[Ancestral home (Chinese)|ancestral home]] was in Xiaojing ({{lang|zh|孝敬里}}), [[Wen County, Henan|Wen County]], [[Henei Commandery]]. His ancestor was [[Sima Ang]] the King of Yin ({{lang|zh|殷王}}), who briefly ruled one of the [[Eighteen Kingdoms]] during the [[Chu–Han Contention|transition period]] from the [[Qin dynasty]] to the [[Western Han dynasty]] before [[Liu Bang]]'s general [[Han Xin]] conquered his territory, capturing Sima Ang and his capital city [[Zhaoge]]. In the early Han dynasty, Sima Ang's former kingdom, which was largely situated in Henei, became a [[Commandery (China)|commandery]] of the Han Empire and his descendants had lived there since.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "楚漢間，司馬卬為趙將，與諸侯伐秦。秦亡，立為殷王，都河內。漢以其地為郡，子孫遂家焉。"<br />"During the Chu-Han transition [206–202 BC], Sima Ang served Zhao as a general and participated with the various lords to attack Qin. When Qin had been destroyed, he was established as King of Yin with Henei as capital [in 206 BC]. Han made the land into a commandery. [Sima Ang's] descendants made their homes there."</ref>

Sima Jūn ({{lang|zh|[[:zh:司馬鈞|司馬鈞]]}}), an eighth-generation descendant of Sima Ang and the great-great-grandfather of Sima Yi, served as a general of the Han Empire, holding the position General Who Conquers the West ({{lang|zh-hant|征西將軍}}).<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "自卬八世，生征西將軍鈞，字叔平。"<br />"After eight generations was born the General who Conquers the West [zhengxi jiangjun], Jun, courtesy name Shuping."</ref> Sima Jūn's son Sima Liang ({{lang|zh-hant|司馬量}}) held the position [[Grand Administrator]] of [[Yuzhang Commandery|Yuzhang]],<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "鈞生豫章太守量，字公度。"<br />"Jun begat Liang, the Grand Administrator of Yuzhang, courtesy name Gongdu."</ref> and Sima Liang's son Sima Jùn ({{lang|zh-hant|司馬儁}}) served as Grand Administrator of [[Yingchuan]].<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "量生潁川太守儁，字元異。"<br />"Liang begat Jùn, the Grand Administrator of Yingchuan, courtesy name Yuanyi."</ref> Sima Jùn's son [[Sima Fang]] served as the Prefect of [[Luoyang]] ({{lang|zh|洛陽令}}), [[Intendant of Jingzhao]], and later as Cavalry Commandant ({{lang|zh|騎都尉}}) towards the end of the [[Eastern Han dynasty]]. Sima Yi was Sima Fang's second son.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "儁生京兆尹防，字建公。帝即防之第二子也。"<br />"Jùn begat Fang, the Intendant of Jingzhao, courtesy name Jiangong. Emperor Xuan of Jin [Sima Yi] was Fang's second son."</ref>

Sima Yi had one elder brother [[Sima Lang|Sima Lang (Boda)]] and six younger brothers.{{efn|in decreasing order of seniority: [[Sima Fu|Sima Fu (Shuda)]], Sima Kui (Jida), Sima Xun (Xianda), Sima Jin (Huida), Sima Tong (Yada), and Sima Min (Youda).}} The eight Sima brothers were collectively known as the "Eight ''Da''s"{{efn|This was also a term of respect, as other groups of eight talented administrators in the [[Three Sovereigns and Five Emperors]] eras were also referred to in this way.{{sfnp|Sakaguchi|2005|p=158}}}} because their [[courtesy name]]s all ended with ''da'' ({{lang|zh|達}}).<ref>{{harvnb|''Book of Jin''|648|loc=vol. 37}}: 安平獻王孚字叔達，宣帝次弟也。初，孚長兄朗字伯達，宣帝字仲達，孚弟馗字季達，恂字顯達，進字惠達，通字雅達，敏字幼達，俱知名，故時號為「八達」焉。"</ref>

==Early life==
Sima Yi displayed intelligence and great ambitions at a young age. He was knowledgeable and well-versed in [[Confucian classics]]. When chaos broke out in China towards the [[End of the Han dynasty]], Sima Yi often expressed sympathy and concern for the people. Before he reached adulthood around the age of 19, Sima Yi once met Yang Jun, a commandery administrator who was known for spotting talents. Yang Jun described him as an "extraordinary talent". [[Cui Yan]], a friend of Sima Yi's elder brother, [[Sima Lang]], once said: "(Sima Yi) is intelligent, decisive, and unique. (Sima Lang) can't be compared to him."<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "少有奇節，聰朗多大略，博學洽聞，伏膺儒教。漢末大亂，常慨然有憂天下心。南陽太守同郡楊俊名知人，見帝，未弱冠，以為非常之器。尚書清河崔琰與帝兄朗善，亦謂朗曰：「君弟聰亮明允，剛斷英特，非子所及也。」"</ref>

Sima Yi and his family used to live in the imperial capital, [[Luoyang]], where his father, [[Sima Fang]], served as a government official. Sima Yi was raised in a strict Confucian manner:{{sfnp|de Crespigny|2010|p=457}} He was not allowed to visit his father unless summoned, to speak to his father without being explicitly addressed, and neither was he allowed to be seated in the same room as his father.<ref>[[Sima Biao]], ''Xuzhuan'': "All of his sons, though they were capped and adults, if they were not ordered "go forward" they did not dare go forward, if they were not ordered "sit" they did not dare sit, and if they were not directed to be heard they did not dare speak. The solemness between father and son was like this.</ref> In 190, when the warlord [[Dong Zhuo]] dominated the Han central government and wanted to relocate the imperial capital to [[Chang'an]], Sima Fang ordered Sima Lang to bring the Sima family out of Luoyang and return to their ancestral home in Wen County, Henei Commandery. Some months later, as Sima Lang foresaw that chaos would break out in Henei Commandery, he relocated his family to Liyang Commandery ([[:zh:黎陽郡|黎陽郡]]; around present-day [[Xun County]], Henan), where they stayed with Sima Lang's kinsman, Zhao Weisun.{{sfnp|de Crespigny|2007|p=1107}} In 194, when [[Battle of Yan Province|war broke out]] between the warlords [[Cao Cao]] and [[Lü Bu]], Sima Lang brought his family out of Liyang Commandery and again returned to their now-ravaged ancestral home in Wen County, Henei Commandery, where Sima Yi and his brothers largely sustained themselves by living as farmers; fending off local groups of bandits while studying diligently during their free time.<ref>{{harvnb|Chen and Pei|429|loc={{strong|15}} }}: "是時董卓遷天子都長安，卓因留洛陽。朗父防為治書御史，當徙西，以四方雲擾，乃遣朗將家屬還本縣。 ...後數月，關東諸州郡起兵，衆數十萬，皆集熒陽及河內。諸將不能相一，縱兵鈔略，民人死者且半。久之，關東兵散，太祖與呂布相持於濮陽，朗乃將家還溫。"</ref>

Around 201, the administrative office of Henei Commandery nominated Sima Yi to serve in the government by holding local office, possibly as a clerk in charge of the records, and in 202 he was sent as a Reporting Officer ({{lang|zh|上計掾}}) to the capital.<ref>{{harvnb|de Crespigny|2010|p=246}} notes: "Under the system of Han, heads of commandery units and provinces were required to present accounts to the court each New Year. The local officer sent to do so was known for that purpose as the Reporting Officer..."<br />{{harvnb|''Book of Jin''|648|loc=vol. 1}} places this event one year earlier: "In the 6th Year of Han's Jian'an era ["Peacefulness Established", 201 AD], the commandery made him Reporting Officer [''shangji yuan'']."</ref> Around the same year, he married a woman named [[Zhang Chunhua]], possibly at the instigation of his father. At the same time, the warlord [[Cao Cao]], who then held the position of Minister of Works in the Han imperial court, heard of Sima Yi's talent and wanted to recruit him to serve in the administration. Sima Yi declined, presumably on grounds of illness, with the ''[[Book of Jin]]'' more specifically mentioning that he, seeing that the Han Empire's future was bleak, declined and lied by supposedly saying that he suffered from [[paralysis]]; staying at home, with Cao Cao's spies reporting that they saw Sima Yi lying motionless in bed.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "漢建安六年，郡舉上計掾。魏武帝為司空，聞而辟之。帝知漢運方微，不欲屈節曹氏，辭以風痺，不能起居。魏武使人夜往密刺之，帝堅卧不動。"</ref>

One day—in a story that may be apocryphal—while Sima Yi was drying his books under the sun, there was a sudden downpour, so he rushed out to grab his books and was seen by a maid. Sima Yi's wife, [[Zhang Chunhua]], feared that the maid would leak out news that Sima Yi was well and get their family into trouble, so she killed the maid to silence her.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 31}}: "宣帝初辭魏武之命，託以風痹，嘗暴書，遇暴雨，不覺自起收之。家惟有一婢見之，后乃恐事泄致禍，遂手殺之以滅口。"</ref><!-- isn't this in the Shishuo Xinyu? I feel like I've read this account in English before. Probably move to another section later. -->

==Service under Cao Cao==
When [[Cao Cao]] became the [[Chancellor (China)|Imperial Chancellor]] in 208, he sent an official to recruit Sima Yi to serve as an assistant clerk in his administration, and is said to have instructed the official to arrest Sima Yi if he dawdled. Sima Yi became afraid and accepted the appointment.{{efn|While there are accounts such as this in the official historical records, they should be regarded with extreme skepticism. Sima Yi's eldest child Sima Shi was also born in 208, and it is possible that this, or other personal issues or feelings on the matter, was a reason for hesitation on Sima Yi's part.}} Although he was initially assigned to be an attendant to the crown prince,{{efn|This "crown prince" was not Cao Cao's son [[Cao Pi]] but an unnamed son of [[Emperor Xian of Han|Emperor Xian]], the figurehead Han emperor under Cao Cao's control. Said son died young, and little is recorded in history about him （太子早卒，...） ''Houhanshu'', vol.09}} he was later reassigned to other positions, including Gentleman of the Yellow Gate ({{lang|zh-hant|黃門侍郎}}), Consultant ({{lang|zh|議郎}}), Officer in the East Bureau of the Imperial Chancellor's Office ({{lang|zh-hant|丞相東曹屬}}), and Registrar in the Imperial Chancellor's Office ({{lang|zh|丞相主簿}}).<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "及魏武為丞相，又辟為文學掾，勑行者曰：「若復盤桓，便收之。」帝懼而就職。於是使與太子游處，遷黃門侍郎，轉議郎、丞相東曹屬，尋轉主簿。"</ref>

===Advising Cao Cao to attack Yi Province===
In 215, Sima Yi accompanied Cao Cao on his campaign against the warlord and [[Taoist]] religious leader [[Zhang Lu (Han dynasty)|Zhang Lu]],{{sfnp|de Crespigny|2007|p=749}} whom Cao Cao defeated at the [[Battle of Yangping]] in [[Hanzhong|Hanzhong Commandery]]. Afterwards Sima Yi urged him to capitalise on the momentum and attack his rival [[Liu Bei]], who was in the neighboring [[Yi Province]]. Sima Yi said because Liu Bei had only recently [[Liu Bei's takeover of Yi Province|seized control of Yi Province]] from [[Liu Zhang (warlord)|Liu Zhang]], he had yet to establish a strong foothold in the province. Cao Cao rejected Sima Yi's idea and said he was already content with having Longyou ({{lang|zh|隴右}}; covering parts of present-day [[Gansu]] and [[Shaanxi]]).<ref>"Sima Yi, Master of Records to the Chancellor, said to Cao Cao, 'Liu Bei has captured Liu Zhang by deceit and force, and the people of Shu are not yet attached to him. Now that he is fighting far away in Jiangling, this is too good a chance to miss. You have conquered Hanzhong, and Yi province is trembling. Send your soldiers against them, and their position will disintegrate. The sage does not oppose the time, and he cannot let such opportunity slip.' 'A man who cannot be satisfied', remarked Cao Cao, 'will get Long and look to Shu.'{{sp}}"<br>Translation {{harvnb|de Crespigny|1996}}.</ref> He then turned his attention to his other key rival [[Sun Quan]].<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "從討張魯，言於魏武曰：「劉備以詐力虜劉璋，蜀人未附而遠爭江陵，此機不可失也。今若曜威漢中，益州震動，進兵臨之，勢必瓦解。因此之勢，易為功力。聖人不能違時，亦不失時矣。」魏武曰：「人苦無足，既得隴右，復欲得蜀！」言竟不從。既而從討孫權，破之。"</ref>

===Urging Cao Cao to usurp the throne===
Sun Quan sent an emissary to meet Cao Cao, asking to make peace and expressing his willingness to pledge allegiance to Cao Cao. He also urged Cao Cao to seize the throne from [[Emperor Xian of Han|Emperor Xian]] and declare himself emperor. In response to Sun Quan's suggestion, Cao Cao remarked; "This kid wants me to put myself on top of a fire!" Sima Yi told him: "The Han dynasty nears its end. Your Lordship controls nine-tenths of the Han Empire. You are in a position to take the throne. Sun Quan's submission is the will of Heaven." Previously, during [[Yu the Great|Yu]]'s time and throughout the [[Xia dynasty|Xia]], [[Shang dynasty|Yin]], and [[Zhou dynasty|Zhou]] dynasties, the rulers who did not hesitate when they should take the throne were the ones who truly understood Heaven's will.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "軍還，權遣使乞降，上表稱臣，陳說天命。魏武帝曰：「此兒欲踞吾著爐炭上邪！」荅曰：「漢運垂終，殿下十分天下而有其九，以服事之。權之稱臣，天人之意也。虞、夏、殷、周不以謙讓者，畏天知命也。」"</ref> Cao Cao did not usurp the throne from Emperor Xian and remained a subject of the Han Empire until his death.

In 216, after Emperor Xian promoted Cao Cao from a duke to a vassal king under the title "King of Wei", Sima Yi became an adviser to Cao Cao's son and [[heir apparent]], [[Cao Pi]], who highly regarded and respected Sima Yi for his brilliance. Along with [[Chen Qun]], [[Wu Zhi]], and Zhu Shuo ([[:zh:朱鑠|朱鑠]]), Sima Yi was one of Cao Pi's close aides and one of his "Four Friends".<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "魏國既建，遷太子中庶子。每與大謀，輒有奇策，為太子所信重，與陳羣、吳質、朱鑠號曰四友。"</ref> Before Cao Pi became his father's heir apparent in 216, he was engaged in a power struggle with his younger brother [[Cao Zhi]] over the succession. During this time, Sima Yi was believed to have secretly backed Cao Pi and helped him win the position of heir apparent. He was also partly responsible for Cao Zhi's demotion and removal from politics after Cao Pi became emperor.{{sfnp|Sakaguchi|2005|p=160}}

When Sima Yi was appointed as an Army Major ({{lang|zh-hant|軍司馬}}), he suggested to Cao Cao to stockpile food supplies and maintain their defences because there were more than 200,000 people who were unable to sustain themselves through farming. Cao Cao accepted his idea and implemented a policy for the people to farm and stockpile grain.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "遷為軍司馬，言於魏武曰：「昔箕子陳謀，以食為首。今天下不耕者蓋二十餘萬，非經國遠籌也。雖戎甲未卷，自宜且耕且守。」魏武納之，於是務農積穀，國用豐贍。"</ref>

===Battle of Fancheng===
{{see also|Battle of Fancheng}}

Sima Yi warned Cao Cao about Hu Xiu ({{lang|zh|胡修}}) and Fu Fang ({{lang|zh|傅方}}), who respectively served as the Inspector of [[Jing Province]] and the Administrator of Nanxiang Commandery ([[:zh:南鄉郡|南鄉郡]]; in Jing Province) at the time. Sima Yi said Hu Xiu was violent and Fu Fang was arrogant, and that neither should be entrusted with the responsibility of guarding the border at Jing Province, but Cao Cao ignored him. In 219, during the [[Battle of Fancheng]], while Cao Cao's general [[Cao Ren]] was besieged by Liu Bei's general [[Guan Yu]] in [[Fancheng]], Cao Cao ordered [[Yu Jin]] to lead reinforcements to lift the siege on Fancheng. The reinforcements were killed in a flood and Yu Jin surrendered to Guan Yu. As Sima Yi foresaw, Hu Xiu and Fu Fang defected to Guan Yu, placing Cao Ren in a more perilous situation.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "帝又言荊州刺史胡脩麤暴，南鄉太守傅方驕奢，並不可居邊。魏武不之察。及蜀將關羽圍曹仁於樊，于禁等七軍皆沒，脩、方果降羽，而仁圍甚急焉。"</ref>

Upon learning of Yu Jin's defeat, Cao Cao felt the Han imperial capital [[Xuchang]] was too near enemy territory so he considered moving the capital further north into [[Hebei]]. Sima Yi and [[Jiang Ji]] said; "Yu Jin's defeat ... was not due to flaws in our defences, nor will it significantly affect us. Moving the imperial capital is showing our weakness to the enemy. It will cause unrest in the regions around the [[Huai River|Huai]] and Mian rivers. Sun Quan and Liu Bei seem close to each other, but they actually don't trust each other. Sun Quan will feel very uneasy upon seeing Guan Yu's victory, so we should incite him to attack Guan Yu's base in Jing Province. This will lift the siege on Fancheng." Cao Cao heeded their advice and Sun Quan later sent his general [[Lü Meng]] to attack [[Gong'an County]] and [[Lü Meng's invasion of Jing Province|invade Jing Province]] in the winter of 219–220. Sun Quan's forces captured and executed Guan Yu.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "是時漢帝都許昌，魏武以為近賊，欲徙河北。帝諫曰：「禁等為水所沒，非戰守之所失，於國家大計未有所損，而便遷都，既示敵以弱，又淮沔之人大不安矣。孫權、劉備，外親內踈，羽之得意，權所不願也。可喻權所，令掎其後，則樊圍自解。」魏武從之。權果遣將呂蒙西襲公安，拔之，羽遂為蒙所獲。"{{pb}}{{harvnb|Chen and Pei|429|loc={{strong|14}} }}:"司馬宣王及濟說太祖曰：「于禁等為水所沒，非戰攻之失，於國家大計未足有損。劉備、孫權，外親內踈，關羽得志，權必不願也。可遣人勸躡其後，許割江南以封權，則樊圍自解。」"{{pb}}{{harvnb|de Crespigny|1996}}: "Sima Yi, however, Major to the Army of the Chancellor, and the Junior Clerk in the Department of the West Jiang Ji both said to him, 'Yu Jin and his comrades were destroyed by the floods, they were not lost in war, and there is yet no real harm to the great plans of our state. Liu Bei and Sun Quan may appear to be close allies, but they have private disagreements. Guan Yu has ambitions, and Sun Quan will never allow him to achieve them. Send a man to encourage Sun Quan to close on his rear, and promise in return to enfeoff him with all land south of the Yangzi. Then the siege of Fan will certainly be broken.' Cao Cao accepted this plan."</ref>

Cao Cao wanted to relocate residents in Jing Province and [[Yingchuan Commandery]] further north as he felt they were too close to enemy territory in the south. Sima Yi, however, advised him against doing so and said; "The Jing and Chu regions are unstable. The people are easy to move but hard to pacify. As Guan Yu has been recently defeated, bad people will go into hiding. If we move the good people, we might cause them to feel distressed and unwilling to return to our side." Cao Cao heeded Sima Yi's advice. The people affected by the Battle of Fancheng reverted to their original livelihoods after the battle.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "魏武以荊州遺黎及屯田在潁川者逼近南寇，皆欲徙之。帝曰：「荊楚輕脫，易動難安。關羽新破，諸為惡者藏竄觀望。今徙其善者，既傷其意，將令去者不敢復還。」從之。其後諸亡者悉復業。"{{pb}}{{harvnb|de Crespigny|1996}}: "Cao Cao was suspicious of the people still remaining in Jing province under his control, and of those in military colonies along the Han. He planned to shift all of them. 'The people of Jing and Chu', argued Sima Yi, 'are fickle and easily swayed. Now that Guan Yu has been defeated, the trouble-makers will have gone into hiding and be reluctant to show themselves. So it is only the people loyal to you that you will be shifting. They will become resentful, while the ones who have already left will never be willing to return.' 'True', agreed Cao Cao. Later, all those who had run away returned from hiding."</ref>

When Cao Cao died in [[Luoyang]] in March 220,{{sfnp|Sima|1084|loc=vol. 69}} there was apprehension in the imperial court. Sima Yi supervised the funerary arrangements to ensure everything would be carried out in an orderly fashion,<ref>{{harvnb|Sima|1084|loc=vol. 69}} places this responsibility on Sima Fu, his younger brother: "Sima Fu reprimanded them: 'Now the King is dead, we ought to pay our respects to his successor as early as possible, for the stabilization of the myriad states. Must we indulge in weeping only?' He then dismissed all of the officials from court, appointed palace guards, and attended to the business of the funeral.</ref> and accompanied the funeral cortège to [[Ye (ancient China)|Ye]],{{sfnp|de Crespigny|2010|p=457}} earning the respect of officials within and outside the central government.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "及魏武薨于洛陽，朝野危懼。帝綱紀喪事，內外肅然。乃奉梓宮還鄴。"</ref>

==Service under Cao Pi==
[[File:歷代聖賢半身像 冊 司馬懿 (Sima Yi).png|thumb|Portrait of Sima Yi (National Palace Museum)]]
After [[Cao Pi]] succeeded his father as the vassal King of Wei and [[Chancellor (China)|Imperial Chancellor]] of the Han Empire in early 220,{{sfnp|Sima|1084|loc=vol. 69}} he enfeoffed Sima Yi as Village Marquis of Hejin ({{lang|zh|河津亭侯}}) and appointed him as his Chief Clerk ({{lang|zh|長史}}).<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "魏文帝即位，封河津亭侯，轉丞相長史。"</ref>

Later, when [[Sun Quan]] led his forces to attack Cao Pi's territories in [[Jing Province]], some officials rejected the idea of resisting Sun Quan because Fancheng and Xiangyang lacked food supplies. [[Cao Ren]], who was defending Xiangyang, had been reassigned from Fancheng to defend [[Nanyang, Henan|Wan]]. Sima Yi said; "Sun Quan has recently defeated Guan Yu. At this time, he will want to be tying up his own business, and will not dare cause us trouble. Xiangyang's land and water routes are crucial to its defences against enemy attacks, so we cannot abandon the city." Cao Pi ignored Sima Yi's advice, and had Cao Ren burn and abandon Xiangyang and Fancheng. As Sima Yi predicted, Sun Quan did not attack afterwards, and Cao Pi regretted not listening to him.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "會孫權帥兵西過，朝議以樊、襄陽無穀，不可以禦寇。時曹仁鎮襄陽，請召仁還宛。帝曰：「孫權新破關羽，此其欲自結之時也，必不敢為患。襄陽水陸之衝，禦寇要害，不可棄也。」言竟不從。仁遂焚棄二城，權果不為寇，魏文悔之。"</ref>

Throughout 220, Sima Yi served as one of the leading officials in court to urge Cao Pi's seizure of the throne,{{sfnp|de Crespigny|2010|p=457}} and was supported by other officials.{{sfnp|de Crespigny|2007|pp=12, 877}}

In late 220, Cao Pi usurped the throne from [[Emperor Xian of Han|Emperor Xian]], ending the Eastern Han dynasty, and declared himself emperor of the newly established state of [[Cao Wei|Wei]].{{sfnp|Sima|1084|loc=vol. 69}} Cao Pi first appointed Sima Yi as a Master of Writing ({{lang|zh|尚書}}) but later reassigned him as an Army Inspector ({{lang|zh-hant|督軍}}) and Palace Assistant Imperial Clerk ({{lang|zh|御史中丞}}). He promoted Sima Yi from a village marquis to a district marquis under the title "District Marquis of Anguo" ({{lang|zh-hant|安國鄉侯}}).<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "及魏受漢禪，以帝為尚書。頃之，轉督軍、御史中丞，封安國鄉侯。"</ref>

In 221, Sima Yi was removed from his post as an Army Inspector, and was appointed as a [[Palace Attendant]] and Right Supervisor of the Masters of Writing ({{lang|zh|尚書右僕射}}).<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "黃初二年，督軍官罷，遷侍中、尚書右僕射。"</ref> This was a position of considerable influence, one of the assistant managers of the Imperial Secretariat, responsible for imperial correspondence and edicts.

In 222, when Cao Pi visited Wan, either because the city was not celebratory enough or because a local market had failed to produce a type of medicine Cao Pi had requested,{{sfnp|de Crespigny|2007|p=954}} the Governor of [[Nanyang Commandery|Nanyang]] Yang Jun (楊俊) under whose authority the city fell, was arrested. Sima Yi, among other officials, was on good terms with Yang Jun, whom he had met during his youth (they were both from Henei Commandery)<ref>"When Sīmǎ [Yì] Xuān-wáng was aged sixteen to seventeen years, he and Jùn met one another. Jùn said: "This is no ordinary man.""<br>Chen Shou, ''Sanguozhi'', vol. 23 (biography of Yang Jun).{{ Full citation needed| date= August 2023| reason= sorry, you can't cite this whole entire book and have that be sufficient. we've moved on since the 1890s}}</ref> and considered capable and intelligent, and pleaded on his behalf; knocking his forehead on the ground until it started bleeding, but Cao Pi dismissed the appeal. Yang Jun, admitting he was at fault, committed suicide. Sima Yi was greatly saddened at such a loss.<ref>"Huángchū third year [222], the Imperial Chariot visited Wǎn, and because the city was not sufficiently celebratory [in its welcome], [Wén-dì] became angry and arrested Jùn. Secretariat Supervisor Sīmǎ Xuān-wáng and Regular Attendants Wáng Xiàng and Xún Wěi pleaded for Jùn, and knocked their heads on the ground until they bled, but the Emperor did not listen. Jùn said: "I already know my crime." Then he killed himself. All considered this unjust and were sorrowful for him."<br>Chen Shou, ''Sanguozhi'', vol.23 (biography of Yang Jun).{{full citation needed | date= August 2023| reason= and of course these are just notes to myself, since i have the book right here and have assumed responsibility for fixing up the citations. unless this weird formatting means the translations are coming from some other source, but I'll have to update them anyway for consistency}}</ref>

Two years later, in September 224, Cao Pi toured the south to inspect his forces near the border between Wei and [[Eastern Wu|Wu]] border. Sima Yi remained behind to defend [[Xuchang]] and his marquis title was changed to "District Marquis of Xiang" ({{lang|zh-hant|向鄉侯}}).{{sfnp|Sima|1084|loc=vol. 70}}

In early 225, he was appointed General Who Pacifies the Army ({{lang|zh-hant|撫軍將軍}}) and placed in command of 5,000 troops, and also held the positions of Official Who Concurrently Serves in the Palace ({{lang|zh|給事中}}) and Manager of the Affairs of the Masters of Writing ({{lang|zh|錄尚書事}}), a promotion from his prior office.{{sfnp|Sima|1084|loc=vol. 70}} When Sima Yi declined to accept these appointments, Cao Pi told him; "I have been busy with the affairs of state all day into the night, with no moment to rest. This isn't a commendation: just sharing the burden."<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "五年，天子南巡，觀兵吳疆。帝留鎮許昌，改封向鄉侯，轉撫軍、假節，領兵五千，加給事中、錄尚書事。帝固辭。天子曰：「吾於庶事，以夜繼晝，無須臾寧息。此非以為榮，乃分憂耳。」"</ref>

The next year, Cao Pi led his armies to attack Sun Quan, and left Sima Yi behind to defend and govern the imperial capital in his absence, as well as providing reinforcements and supplies for his armies at the frontline. Before departing, Cao Pi issued a decree; "I am deeply concerned about my posterity. This is why I entrust you with this responsibility. Even though [[Cao Shen]] made many contributions on the battlefield, [[Xiao He]] played a more important role than him. Would that I could but be free of looking back over my shoulder at the west (referring to [[Shu Han]])!"<!-- meeting archaicism with archaicism --> Cao Pi later returned from [[Guangling Commandery]] to [[Luoyang]]. He told Sima Yi, "When I am in the east, you will be in charge of the west; when I am in the west, you will be in charge of the east." Sima Yi remained behind to guard [[Xuchang]].<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "六年，天子復大興舟師征吳，復命帝居守，內鎮百姓，外供軍資。臨行，詔曰：「吾深以後事為念，故以委卿。曹參雖有戰功，而蕭何為重。使吾無西顧之憂，不亦可乎！」天子自廣陵還洛陽，詔帝曰：「吾東，撫軍當總西事；吾西，撫軍當總東事。」於是帝留鎮許昌。"</ref>

In mid 226, when Cao Pi became critically ill, he summoned Sima Yi, [[Cao Zhen]], [[Chen Qun]], and possibly [[Cao Xiu]] to meet him in the south hall of Chonghua Palace ({{lang|zh-hant|崇華殿}}), where he ordered them to assist his son [[Cao Rui]] after his death. Cao Pi also told Cao Rui; "There may be those who would alienate these [[Three Ducal Ministers|Three Excellencies]] from you, but be careful and do not doubt them".<ref>{{harvnb|Sima|1084|loc=vol. 70}}{{pb}}{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "及天子疾篤，帝與曹真、陳羣等見於崇華殿之南堂，並受顧命輔政。詔太子曰：「有間此三公者，慎勿疑之。」"{{pb}}{{harvnb|Fang|1952}}: "Jin Shu, Chronicle of Xuandi, has: "When he was severely ill, the son of Heaven received in audience Xuandi (i.e. Sima Yi) as well as Cao Zhen and Chen Qun, et al., in the southern hall of the palace of Zhonghuatian; they all received the Imperial testament appointing them to serve as guardian regents. The [[Son of Heaven]] said to the Crown Prince, 'There may be those who would alienate these Three Ducal Ministers from you, but be careful and do not doubt them.'"<br />[[Achilles Fang]] notes: "One gets the impression that [[Sima Guang]] on the whole prefers to follow the ''[[Book of Jin|Jin Shu]]'' in regard to matters concerned with Sima Yi; here he certainly neglects the ''[[Records of the Three Kingdoms|SGZ]]'' account, which mentions four persons as guardians."</ref>

==Service under Cao Rui==
===Driving back Wu invaders===
After [[Cao Rui]] became Emperor of Wei, he elevated Sima Yi from the status of a district marquis to a county marquis under the title "Marquis of Wuyang".<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "明帝即位，改封舞陽侯。"</ref> Around that time, [[Sun Quan]] attacked [[Jiangxia Commandery]] and sent his generals [[Zhuge Jin]] and Zhang Ba ({{lang|zh-hant|張霸}}) to attack [[Xiangyang]]. Sima Yi led Wei forces to resist the Wu invaders, defeated Zhuge Jin, and killed Zhang Ba and more than 1,000 Wu soldiers.{{sfnp|Sima|1084|loc=vol. 70}} In recognition of Sima Yi's efforts, Cao Rui promoted him to General of Agile Cavalry ({{lang|zh-hant|驃騎將軍}}).<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "及孫權圍江夏，遣其將諸葛瑾、張霸并攻襄陽，帝督諸軍討權，走之。進擊，敗瑾，斬霸，并首級千餘。遷驃騎將軍。"{{pb}}{{harvnb|Watanabe|2006|p=283}}; {{harvnb|Sima|1084|loc=vol. 70}}.{{pb}}"During the time of [[Emperor Ling of Han|Emperor Ling]], the position of General of the Agile Cavalry was an honorific one that did not come with an actual field command. It was a very high honor, just below that of Grand General [who ranked above the Three Excellencies and was thus second only to the emperor]. It is unknown whether this title inherently included field command under Cao Rui, but it is clear from context that it was still, if nothing else, a very great honor." de Crespigny, Later Han Military Organisation {{full citation needed| date=August 2023 | reason= this title does not appear in the bibliography of de Crespigny 2010, which cites a number of the author's prior publications}}</ref>

===Suppressing Meng Da's rebellion===
{{further|Xincheng Rebellion}}
[[File:Defeat of Meng Da.jpg|thumb|upright=1.5|A [[Qing dynasty]] illustration of Meng Da's death at Xincheng.]]

In July 227, Cao Rui ordered Sima Yi to garrison at [[Nanyang, Henan|Wan]], and put him charge of the military affairs of [[Jing Province|Jing]] and [[Yuzhou (ancient China)|Yu]] provinces.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "太和元年六月，天子詔帝屯于宛，加督荊、豫二州諸軍事。"{{pb}}{{harvnb|Sima|1084|loc=vol. 70}}.</ref>

During Cao Pi's reign, Sima Yi had warned Cao Pi [[Meng Da]], a former Shu general who had defected to Wei, was untrustworthy, but Cao Pi had ignored him.{{sfnp|Sakaguchi|2005|p=160}} Sima Yi was proven right after Cao Pi's death when in late 227, Sima Yi received news Meng Da was planning to rebel against Wei and return to Shu; according to the ''[[Weilüe]]'', he had sent his adviser Liang Ji ({{lang|zh|梁幾}}) to investigate Meng Da's case while urging Meng Da to visit Luoyang to attend to the Wei court, which alarmed the latter, persuading Meng Da to rebel.<ref>{{harvnb|Yu, ''Weilüe''}}: "諸葛亮聞之，陰欲誘達，數書招之，達與相報答。魏興太守申儀與達有隙，密表達與蜀潛通，帝未之信也。司馬宣王遣參軍梁幾察之，又勸其入朝。達驚懼，遂反。" Cited in {{harvnb|Chen and Pei|429|loc={{strong|3}} }}.{{pb}}{{harvnb|Sima|1084|loc=vol. 70}}.</ref>

According to the ''[[Book of Jin]]'' and ''[[Zizhi Tongjian]]'', Sima Yi, upon hearing Meng Da wished to rebel, wrote a flattering letter to Meng Da to distract and confuse him while preparing to suppress the rebellion. While Meng Da was deciding whether to commit to his rebellion, Sima Yi swiftly assembled his troops and secretly led them to attack Meng Da's base in Shangyong Commandery ([[:zh:上庸郡|上庸郡]]; around present-day [[Zhushan County]], Hubei).{{sfnp|Sima|1084|loc=vol. 70}} While heading towards the location, Sima Yi's subordinates suggested they observe Meng Da's actions first before advancing but Sima Yi replied, "[Meng] Da is not a trustworthy person. Now that he is hesitating due to suspicions, we should seize this opportunity to get rid of him." The marching speed was quickened and, covering 2,200 [[Li (unit)|''li'']], Sima Yi arrived within eight days{{sfnp|Sima|1084|loc=vol. 70}} and ordered his subordinates to lead separate detachments to intercept and block Meng Da's reinforcements in the form of Shu and Wu forces that had just arrived at Anqiao ({{lang|zh|安橋}}) and Mulan Fort ({{lang|zh|木闌塞}}) in Xicheng ({{lang|zh|西城}}) respectively.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "達與魏興太守申儀有隙，亮欲促其事，乃遣郭模詐降，過儀，因漏泄其謀。達聞其謀漏泄，將舉兵。帝恐達速發，以書喻之曰：「將軍昔棄劉備，託身國家，國家委將軍以疆埸之任，任將軍以圖蜀之事，可謂心貫白日。蜀人愚智，莫不切齒於將軍。諸葛亮欲相破，惟苦無路耳。模之所言，非小事也，亮豈輕之而令宣露，此殆易知耳。」達得書大喜，猶與不決。帝乃潛軍進討。諸將言達與二賊交構，宜觀望而後動。帝曰：「達無信義，此其相疑之時也，當及其未定促決之。」乃倍道兼行，八日到其城下。吳蜀各遣其將向西城安橋、木闌塞以救達，帝分諸將以距之。"{{pb}}{{harvnb|Sima|1084|loc=vol. 70}} reverses the locations of the Shu and Wu forces.</ref>

Meng Da was taken by surprise, having not expected Sima Yi to appear so quickly at Shangyong Commandery. Meng Da was surrounded on three sides by a river so he set up wooden barriers to defend himself. Sima Yi's forces crossed the rivers, destroyed the barriers, and arrived just outside Shangyong. Sima Yi split up his forces and attacked the city from eight directions for over two weeks. On the sixteenth day, Meng Da's nephew Deng Xian ({{lang|zh|鄧賢}}) and subordinate Li Fu ({{lang|zh|李輔}}) opened the city gates and surrendered to Sima Yi. Meng Da was captured and executed,{{sfnp|Sima|1084|loc=vol. 70}} and his head was sent to the capital [[Luoyang]]; more than 10,000 captives were taken and Sima Yi returned to Wan in triumph.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "...及兵到，達又告亮曰：「吾舉事八日，而兵至城下，何其神速也！」上庸城三面阻水，達於城外為木柵以自固。帝渡水，破其柵，直造城下。八道攻之，旬有六日，達甥鄧賢、將李輔等開門出降。斬達，傳首京師。俘獲萬餘人，振旅還于宛。"</ref>

===Governing Jing and Yu provinces===
While he was in charge of Jing and Yu provinces, Sima Yi encouraged and promoted agriculture, and reduced wastage of public funds. The people of the southern lands were happy and showed their support for him.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "乃勸農桑，禁浮費，南土悅附焉。"</ref>

Shen Yi, a former subordinate of Meng Da, had remained in Weixing Commandery ([[:zh:魏興郡|魏興郡]]; around present-day [[Ankang]], Shaanxi) and had become deeply entrenched there. Shen Yi had been illegally using the Wei emperor's name to carve official stamps and seals, and giving them to others. After hearing of Meng Da's fall, he became worried he would be the next target of Sima Yi's crackdown on traitorous officials. After Sima Yi had suppressed Meng Da's rebellion, many regional officials came to present gifts and congratulate him. Sima Yi sent a messenger to provoke Shen Yi and lure him into a trap. When Shen Yi went to confront Sima Yi, he was captured and sent to the imperial capital.{{sfnp|Sima|1084|loc=vol. 70}} Sima Yi relocated to [[You Province]] with more than 7,000 households from Shangyong Commandery. The Shu military officers Yao Jing ({{lang|zh|姚靜}}), Zheng Tuo ({{lang|zh-hant|鄭他}}), and others later brought more than 7,000 men with them to surrender to Sima Yi.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "初，申儀久在魏興，專威疆埸，輒承制刻印，多所假授。達既誅，有自疑心。時諸郡守以帝新克捷，奉禮求賀，皆聽之。帝使人諷儀，儀至，問承制狀，執之，歸于京師。又徙孟達餘衆七千餘家于幽州。蜀將姚靜、鄭他等帥其屬七千餘人來降。"{{pb}} These Shu military officers, who are primarily referenced in the ''[[Book of Jin]]'', do not appear in the ''[[Zizhi Tongjian]]'', ''[[Records of the Three Kingdoms]]'', or ''[[Chronicles of Huayang]]''.</ref>

Among the thousands of people who migrated to Wei from Shu, many were unregistered residents whom the Wei government wanted to register as citizens of Wei. The Wei emperor Cao Rui summoned Sima Yi back to Luoyang and sought his opinion on this issue. Sima Yi said: "The enemy seized these people through deception and now abandoned them. If we acknowledge their position in our great apparatus of state, they will naturally feel happy and at ease." Cao Rui then asked him which of Wei's two rival states (Wu and Shu) they should attack first. Sima Yi replied: "The people of Wu know that we in the Central States are not adept in naval warfare, hence they dare to live in [[Chaohu City|Dongguan]]. When we attack an enemy, we should always block its throat and strike its heart. [[Hankou|Xiakou]] and Dongguan are the enemy's heart and throat. If we can move our land forces to Wan{{efn|This Wan (皖) was not the same place as Wan (宛; in present-day [[Nanyang, Henan]]), where Sima Yi was stationed at. This Wan (皖) referred to a location at present-day [[Qianshan County]], Anhui.}} to lure Sun Quan to advance east, then take advantage of his absence from Xiakou by sending our navy to attack it, it will be like an army from Heaven descending to attack, victory assured." Cao Rui agreed with Sima Yi's view and ordered him to return to his post at Wan.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "時邊郡新附，多無戶名，魏朝欲加隱實。屬帝朝于京師，天子訪之於帝。帝對曰：「賊以密網束下，故下棄之。宜弘以大綱，則自然安樂。」又問二虜宜討，何者為先？對曰：「吳以中國不習水戰，故敢散居東關。凡攻敵，必扼其喉而摏其心。夏口、東關，賊之心喉。若為陸軍以向皖城，引權東下，為水戰軍向夏口，乘其虛而擊之，此神兵從天而墮，破之必矣。」天子並然之，復命帝屯于宛。"</ref>

Around August 228, during the time of the [[Battle of Shiting]], records make brief mention of Sima Yi's involvement in the events by stating he led Wei forces into [[Jingzhou|Jiangling]].{{sfnp|Sima|1084|loc=vol. 71}}

===Campaign against Shu===
{{main|Ziwu Campaign}}
[[File:SimaYi.jpg|thumb|160px|A portrait of Sima Yi from a [[Qing dynasty]] edition of the ''[[Romance of the Three Kingdoms]]'']]
In March 230, Sima Yi was promoted to General-in-Chief ({{lang|zh-hant|大將軍}}), appointed Grand Chief Controller ({{lang|zh|大都督}}) in charge of multiple commanderies, and – in a continuation of an extremely early tradition – bestowed a ceremonial yellow battle axe. The Wei emperor [[Cao Rui]] put him and Cao Zhen in charge of defending Wei's western borders from attacks by its rival state Shu, which had been [[Zhuge Liang's Northern Expeditions|launching invasions]] since 228. At Cao Zhen's instigation, a campaign against Shu was proposed and eventually implemented after Cao Rui approved his proposal.<ref>{{harvnb|Chen and Pei|429|loc={{strong|9}}, biography of Cao Zhen }}: "眞以「蜀連出侵邊境，宜遂伐之。數道並入，可大克也」。帝從其計。"</ref> In August 230, Cao Zhen led an army from [[Chang'an]] to attack Shu via the Ziwu Valley ({{lang|zh|子午谷}}). At the same time, another Wei army led by Sima Yi, acting on Cao Rui's order, advanced towards Shu from [[Jing Province]] by sailing along the [[Han River (Hanshui)|Han River]]. The rendezvous point for Cao Zhen and Sima Yi's armies was at [[Hanzhong#History|Nanzheng]]. The army led by Sima Yi passed through Zhuoshan ({{lang|zh|斫山}}) and Xicheng County ({{lang|zh|西城縣}}; present-day Ankang, Shaanxi), sailed along the Mian River to Quren County ({{lang|zh|朐忍縣}}; west of Yunyang County, Chongqing), and arrived at Xinfeng County ({{lang|zh|新豐縣}}; south of Weinan, Shaanxi). He made camp at Dankou ({{lang|zh|丹口}}). Other Wei armies also prepared to attack Shu from the Xie Valley ({{lang|zh|斜谷}}) or [[Wuwei, Gansu|Wuwei Commandery]]. The campaign, however, had to be aborted by October 230<ref>{{harvnb|Chen and Pei|429|loc={{strong|3}} }}: "[太和四年]九月，大雨，伊、洛、河、漢水溢，詔眞等班師。"</ref> because the [[gallery road]]s leading into Shu were too damaged for the troops to pass through, and because of constant heavy rain that had lasted for more than 30 days.<ref>{{harvnb|Chen and Pei|429|loc={{strong|9}}, biography of Cao Zhen }}: "眞當發西討，帝親臨送。眞以八月發長安，從子午道南入。司馬宣王泝漢水，當會南鄭。諸軍或從斜谷道，或從武威入。會大霖雨三十餘日，或棧道斷絕，詔眞還軍。"{{pb}}{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "四年，遷大將軍，加大都督、假黃鉞，與曹真伐蜀。帝自西城斫山開道，水陸並進，泝沔而上，至于朐<!-- [] ← what is this matching pair of square brackets about? i'll have a look at the source later -->。拔其新豐縣。軍次丹口，遇雨，班師。"</ref>

===Battle of Mount Qi===
{{main|Battle of Mount Qi}}

In 231, Shu forces led by [[Zhuge Liang]] attacked [[Tianshui|Tianshui Commandery]], and besieged Wei forces led by Jia Si ({{lang|zh|賈嗣}}) and Wei Ping ({{lang|zh|[[:zh:魏平|魏平]]}}) at Mount Qi ({{lang|zh|祁山}}; the mountainous regions around present-day [[Li County, Gansu]]). Cao Rui ordered Sima Yi to move to [[Chang'an]] to supervise military operations in [[Yong Province|Yong]] and [[Liang Province|Liang]] provinces.{{sfnp|Sima|1084|loc=vol. 72}} Sima Yi then ordered Fei Yao and Dai Ling to protect Shanggui County ({{lang|zh|上邽縣}}; in present-day Tianshui, Gansu) with 4,000 elite troops and set out with the rest of his men westward to relieve the mountainous battlefield. [[Zhang He]] wanted to take a detachment and station it at [[Fengxiang County#History|Yong]] and [[Mei County|Mei]] counties but Sima Yi reasoned: "If the vanguard is able to face the enemy alone, your words are right; but should they not be able to do so, the dividing of the forces into vanguard and rear would be unwise; in this manner the Three Armies of [[Chu (state)|Chu]] were captured by [[Ying Bu|Qing Bu]]."{{sfnp|Sima|1084|loc=vol. 72}} After making preparations for battle, Sima Yi, with Zhang He, [[Fei Yao]], Dai Ling ({{lang|zh|[[:zh:戴陵|戴陵]]}}), and [[Guo Huai]] serving as his subordinates, led the Wei forces to Yumi County ({{lang|zh|隃麋縣}}; east of [[Qianyang County]], Shaanxi) and stationed there.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "明年，諸葛亮寇天水，圍將軍賈嗣、魏平於祁山。 ...乃使帝西屯長安，都督雍、梁二州諸軍事，統車騎將軍張郃、後將軍費曜、征蜀護軍戴淩、雍州刺史郭淮等討亮。 ...遂進軍隃麋。"</ref>

When Zhuge Liang heard of the Wei army's arrival, he led his troops to Shanggui County to collect the harvest. Without good coordination, Sima Yi's subordinates defied his order to defend their positions; a detachment of the Wei army went to attack the Shu forces but were defeated,{{sfnp|Sima|1084|loc=vol. 72}} although accounts from the ''Book of Jin'' make no mention of a detachment being defeated,<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "遂進軍隃麋。亮聞大軍且至，乃自帥眾將芟上邽之麥。諸將皆懼，帝曰：「亮慮多決少，必安營自固，然後芟麥，吾得二日兼行足矣。」"</ref> and records of the campaign tend to vary and prove unreliable.<ref>According to {{harvnb|Fang|1952}}'s notes [Taihe 5 and 8], the information in ''Zizhi Tongjian'' regarding this campaign is from the ''Chronicles of Han and Jin [Han–Jin Chunqiu]'' by [[Xi Zuochi]], who also wrote the ''Records of Xiangyang [Xiangyang Ji]''. Xi was an unapologetic supporter of the state of Shu and was among the first to argue Liu Bei's state was the legitimate successor to the Han; he refers to Liu Bei's state as Han rather than Shu. Xi Zuochi is extremely biased in favour of the Liu faction and any information from the ''Chronicles of Han and Jin'' [and ''Records of Xiangyang''] must be regarded with skepticism and should be considered generally unreliable.<!-- wish i had access to Fang 1952 to see how much of this is a quote and how much is wikipedian editorialising. "generally unreliable" is a wikipedia term, and "extremely biased" feels like an overstatement. Cutter's english language work on Xi Zuochi doesn't go nearly so far --></ref> After defeating the enemy, Zhuge Liang foraged for the early spring wheat that was available in the vicinity. Sima Yi's subordinates feared losing the wheat but Sima Yi stated: "Zhuge Liang thinks too much and makes too few decisions. He'll be fortifying his camp and defences first before coming to harvest the wheat. Two days is sufficient for me [to reach Shanggui County]." He arrived within two days after travelling overnight. When Zhuge Liang and his men heard Sima Yi was marching towards their position, they swiftly retreated instead of giving battle.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "亮聞大軍且至，乃自帥衆將芟上邽之麥。 ...於是卷甲晨夜赴之，亮望塵而遁。"</ref><!-- Sima Yi commented: "I'm weary from travelling day and night. This is because I know what militarists covet. Zhuge Liang does not dare to remain near the Wei River. This is easy for me."{{efn|{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "諸將皆懼，帝曰：「亮慮多決少，必安營自固，然後芟麥，吾得二日兼行足矣。」於是卷甲晨夜赴之，亮望塵而遁。帝曰：「吾倍道疲勞，此曉兵者之所貪也。亮不敢據渭水，此易與耳。」"{{relevance inline|date=August 2023}} }} --> Initially, the Wei emperor [[Cao Rui]] wanted to supply Sima Yi's army with the wheat in Shanggui County and had rejected a proposal to transport grain from [[Guanzhong]] to the front line. Zhuge Liang's movements, however, were quicker than Cao Rui anticipated; only a portion of the wheat produce in Shanggui County was left after the Shu army's harvesting. The Wei general [[Guo Huai]] then asserted his influence over local nomadic tribes and forced them to hand over food supplies for the Wei army.<ref>{{harvnb|Chen and Pei|429|loc={{strong|26}} }}: "是時，隴右無谷，議欲關中大運，淮以威恩撫循羌、胡，家使出谷，平其輸調，軍食用足，轉揚武將軍。"</ref> The Wei army was thus able to gain access to food supplies without assistance from the central government in Luoyang.

Sima Yi again encountered Zhuge Liang, this time east of Shanggui County at Hanyang ({{lang|zh|漢陽}}) but no direct engagement occurred; Sima Yi drew in his troops and put them into formation while waiting, finding protection in the nearby [[Defile (geography)|defiles]]; concurrently he sent [[Niu Jin]] to lead a lightly armed cavalry detachment to lure the enemy to Mount Qi, who in the process briefly engaged in battle with Shu vanguard commander [[Ma Dai]] and inflicted some losses on the enemy. Zhuge Liang simultaneously withdrew his forces and Sima Yi thereafter closely followed Zhuge Liang from the rear. Zhang He advised against pursuit on grounds they could effectively station at Mount Qi, combine their forces, and conduct irregular expeditions; Zhuge Liang's provisions were running low and he would soon be forced to retreat, but Sima Yi did not heed this advice and continued his pursuit.{{sfnp|Sima|1084|loc=vol. 72}} Zhuge Liang ordered a retreat towards the eastern side of the Mount Qi ridges, where the Shu army fortified at Lucheng ({{lang|zh|鹵城}}), seizing control of the hills in the north and south, and using the river as a natural barrier while pitching "covering camps" near the riverbank to take complete control of the water passage.<ref>{{harvnb|Xi, ''Han–Jin Chunqiu''}}: "亮屯鹵城，據南北二山，斷水為重圍。" Cited in {{harvnb|Chen and Pei|429|loc={{strong|35}} }}.{{pb}}{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "進次漢陽，與亮相遇，帝列陣以待之。使將牛金輕騎餌之，兵才接而亮退，追至祁山。亮屯鹵城，據南北二山，斷水為重圍。"{{pb}}{{harvnb|Sima|1084|loc=vol. 72}}.</ref>

Although his subordinates repeatedly urged Sima Yi to attack the enemy, he was hesitant to do so after seeing the layout of the Shu camps in the hills. He relented when his subordinates criticised and mocked him by saying he would become a laughing stock if he refused to attack.{{sfnp|Sakaguchi|2005|p=161}} Sima Yi sent [[Zhang He]] to attack the southern Shu camps that were guarded by [[Wang Ping (Three Kingdoms)|Wang Ping]] while he led a frontal assault on Lucheng from the central avenue.<ref>{{harvnb|Xi, ''Han–Jin Chunqiu''}}: "使張郃攻無當監何平於南圍，自案中道向亮。" Cited in {{harvnb|Chen and Pei|429|loc={{strong|35}} }}.{{pb}}{{harvnb|Sima|1084|loc=vol. 72}}.</ref> In response, Zhuge Liang ordered [[Wei Yan]], [[Wu Ban]], and [[Gao Xiang (Three Kingdoms)|Gao Xiang]] to lead troops to engage and resist the enemy outside Lucheng.{{sfnp|Sima|1084|loc=vol. 72}} The Wei forces suffered an unexpected and large defeat: 3,000 soldiers were killed, and 5,000 suits of armour and 3,100 sets of hornbeam crossbows were seized by the Shu forces but Sima Yi retained a sizable army, which he led back to his camp.<ref>{{harvnb|Xi, ''Han–Jin Chunqiu''}}: "亮使魏延、高翔、吳班赴拒，大破之，獲甲首三千級，玄鎧五千領，角弩三千一百張，宣王還保營。" Cited in {{harvnb|Chen and Pei|429|loc={{strong|35}} }}.{{pb}}{{harvnb|Sima|1084|loc=vol. 72}}.</ref>

Despite his victory, Zhuge Liang could not make use of the momentum to launch a major offensive on the enemy because his army was running low on supplies.{{sfnp|Sima|1084|loc=vol. 72}} The ''Book of Jin'' said Sima Yi launched an attack on the Shu garrisons at this juncture and captured the Shu "covering camps". Zhuge Liang abandoned Lucheng and retreated in the night but Sima Yi pursued him and inflicted roughly 10,000 casualties on the Shu army. This account from the ''Book of Jin'' is disputed by historians<ref>{{harvnb|''Book of Jin''|648|loc= vol. 1}}: "縱其後出，不復攻城，當求野戰，必在隴東，不在西也。"{{pb}}"(時宣王等糧亦盡) ''Huayangguo Zhi'' vol. 7.</ref> and is not included in the ''Zizhi Tongjian''. According to the ''Records of the Three Kingdoms'' and ''Zizhi Tongjian'', Zhuge Liang retreated due to a lack of supplies rather than defeat,<ref>{{harvnb|Chen and Pei|429|loc={{strong|35}} }}: "糧盡退軍".{{pb}}{{harvnb|Sima|1084|loc=vol. 72}}: "六月，亮以糧盡退軍".</ref> and the Wei forces pursued him. The pursuit did not go completely smoothly for Wei; Sima Yi had ordered [[Zhang He]] to further pursue the enemy in an attempt to capitalise on their momentum. According to the ''Weilüe'', Zhang He initially refused to obey Sima Yi's order and argued according to classical military doctrine, one should refrain from pursuing an enemy force retreating to its home territory. Sima Yi refused to listen and forced Zhang He to carry out this order. Zhang He fell into an ambush at Mumen Trail ({{lang|zh|木門道}}; in Tianshui, Gansu), where Zhuge Liang had ordered crossbowmen to hide on high ground and fire at approaching enemy forces when they entered a narrow defile. Zhang He died after a stray arrow hit him in the right knee.<ref>{{harvnb|Yu, ''Weilüe''}}: "亮軍退，司馬宣王使郃追之，郃曰：「軍法，圍城必開出路，歸軍勿追。」宣王不聽。郃不得已，遂進。蜀軍乘高布伏，弓弩亂發，矢中郃髀。" Cited in {{harvnb|Chen and Pei|429|loc={{strong|17}} }}.{{pb}}{{harvnb|Sima|1084|loc=vol. 72}}.</ref> Regardless of this setback, Cao Rui sent an emissary to congratulate Sima Yi on his victory and rewarded him by adding more taxable households to his marquisate.<ref>{{harvnb|Chen and Pei|429|loc={{strong|3}} }}: "秋七月丙子，以亮退走，封爵增位各有差。"{{pb}}{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "天子使使者勞軍，增封邑。"</ref>

Sima Yi's advisors [[Du Xi]]{{sfnp|de Crespigny|2007|p=185}} and Xue Ti ({{lang|zh|薛悌}}) told Sima Yi the wheat would be ready for harvest the following year and Zhuge Liang would be sure to come seize it. Because Longyou lacked food supplies, they should transport the wheat there that winter. Sima Yi said: "Zhuge Liang advanced towards Mount Qi again and attacked Chencang [{{lang|zh|陳倉}}; east of [[Baoji]], Shaanxi] but lost and withdrew. If he advances again, instead of attacking cities, he will call for a battle in the east of Longyou and not the west. Zhuge Liang feels frustrated whenever there is shortage of grain, so he will stockpile supplies when he returns [to Shu]. I predict he won't attack again without at least three harvests' worth of food supplies." Sima Yi then proposed to the Wei imperial court to mobilise farmers from [[Ji Province]] to Shanggui County and put them under the jurisdiction of [[Jingzhao Commandery|Jingzhao]], [[Tianshui Commandery|Tianshui]], and Nan'an ({{lang|zh|南安}}) commanderies.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "時軍師杜襲、督軍薛悌皆言明年麥熟，亮必為寇，隴右無穀，宜及冬豫運。帝曰：「亮再出祁山，一攻陳倉，挫衄而反。縱其後出，不復攻城，當求野戰，必在隴東，不在西也。亮每以粮少為恨，歸必積穀，以吾料之，非三稔不能動矣。」於是表徙冀州農夫佃上邽，興京兆、天水、南安監冶。"</ref> By 233, Sima Yi's agricultural plan came to fruition and became a source of food supplies for the three commanderies.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "青龍元年，穿成國渠，築臨晉陂，溉田數千頃，國以充實焉。"</ref>

===Battle of Wuzhang Plains===
{{main|Battle of Wuzhang Plains}}
[[File:Living Zongda Fleeing.jpg|thumb|upright=1.5|A [[Qing dynasty]] illustration of "a dead Zhuge drives away a living Zhongda".]]

In March or April 234, Zhuge Liang led up to 100,000 Shu troops out of the Xie Valley ({{lang|zh|斜谷}})<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "二年，亮又率衆十餘萬出斜谷，壘于郿之渭水南原。"{{pb}}{{harvnb|Sima|1084|loc=vol. 72}}.</ref> and camped at the southern bank of the [[Wei River]] near [[Mei County]].{{sfnp|Sima|1084|loc=vol. 72}}

Sima Yi's subordinates wanted to station their camp north of the Wei River but Sima Yi said: "Many civilians have gathered at the south of the Wei River. That is certain to be a hotly contested location." Sima Yi then led his troops across the river, took up his position with his rear facing the river, and began constructing fortifications.<ref>{{harvnb|Sima|1084|loc=vol. 72}}.{{pb}}{{harvnb|Fang|1952}}: "Jin Shu has: "He encamped in the plain south of the Wei river, in Mei." Then it continues: "The Son of Heaven (i.e. Mingdi) was anxious at this and sent the ''zhengshu hujun'' Qin Lang to lead twenty thousand infantry and cavalry and put himself under Xuandi's direction. The generals wished to go to the north side of the Wei and wait for him (i.e. Zhuge Liang). Xuandi said, 'The people's provisions are all stored south of the Wei; it is a place that we must contend for.'"</ref> He also said: "If Zhuge Liang is brave enough, he'll move out from [[Wugong County]] and head eastward in the direction of the mountains. If he moves west to the [[Wuzhang Plains]], we'll have no worries."<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "諸將欲住渭北以待之，帝曰：「百姓積聚皆在渭南，此必爭之地也。」遂引軍而濟，背水為壘。因謂諸將曰：「亮若勇者，當出武功，依山而東。若西上五丈原，則諸軍無事矣。」"{{pb}}{{harvnb|Sima|1084|loc=vol. 72}}.</ref> Around that time, the Wei emperor Cao Rui became worried and decided to send the general [[Qin Lang]] to lead 20,000 infantry and cavalry as reinforcements to join Sima Yi.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "天子憂之，遣征蜀護軍秦朗督步騎二萬，受帝節度。"{{pb}}{{harvnb|Sima|1084|loc=vol. 72}}.</ref>

While Sima Yi and his troops were stationed at the south of the Wei River, [[Guo Huai]] urged him and the officers to move a detachment to the plains on the river's north bank because he foresaw Zhuge Liang would attempt to seize the plains.{{sfnp|Sima|1084|loc=vol. 72}} When the other officers disagreed,<ref>{{harvnb|Chen and Pei|429|loc={{strong|26}} }}: "青龍二年，諸葛亮出斜谷，並田于蘭坑。是時司馬宣王屯渭南；淮策亮必爭北原，宜先據之，議者多謂不然。"</ref> Guo Huai stated: "If Zhuge Liang crosses the Wei River and occupies those plains, his troops will have access to the mountains in the north. If they block the road through the mountains, it will cause fear and panic among the people living in the region. This isn't helpful to our state."<ref>{{harvnb|Chen and Pei|429|loc={{strong|26}} }}: "淮曰：「若亮跨渭登原，連兵北山，隔絕隴道，搖盪民、夷，此非國之利也。」"{{pb}}{{harvnb|Sima|1084|loc=vol. 72}}.</ref> Sima Yi finally agreed with Guo Huai and sent him to occupy the plains. While Guo Huai and his men were building a camp on the plains, they came under attack by Shu forces but drove them back.<ref>{{harvnb|Chen and Pei|429|loc={{strong|26}} }}: "宣王善之，淮遂屯北原。塹壘未成，蜀兵大至，淮逆擊之。"{{pb}}{{harvnb|Sima|1084|loc=vol. 72}}.</ref>

Zhuge Liang moved his army west to the [[Wuzhang Plains]]{{sfnp|Sima|1084|loc=vol. 72}} and prepared to cross to the northern bank of the Wei River. Sima Yi sent Zhou Dang ({{lang|zh|周當}}) to station at Yangsui ({{lang|zh|陽遂}}; the area north of the Wei River in present-day [[Mei County|Mei]] and [[Fufeng County|Fufeng]] counties in Shaanxi) and lure Zhuge Liang to attack him. Zhuge Liang, however, did not mobilise his troops for several days. Sima Yi said: "Zhuge Liang wants to take control of the Wuzhang Plains and won't advance towards Yangsui. His intention is obvious." He then sent {{ill|Hu Zun|zh|胡遵}} and Guo Huai to defend Yangsui. Several days later, Guo Huai received news Zhuge Liang was planning to launch an attack in the west and Guo Huai's subordinates wanted to strengthen their defences in the west. Guo Huai was the only one who recognised it was a ruse and that Zhuge Liang was planning to attack Yangsui. He was proven right later as the Shu forces attacked Yangsui at night. Because Guo Huai had earlier set up defences, the Shu forces failed to capture Yangsui. Zhuge Liang could not advance further so he retreated to the Wuzhang Plains.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "亮果上原，將北渡渭，帝遣將軍周當屯陽遂以餌之。數日，亮不動。帝曰：「亮欲爭原而不向陽遂，此意可知也。」遣將軍胡遵、雍州剌史郭淮共備陽遂，與亮會于積石。臨原而戰，亮不得進，還于五丈原。"{{pb}}{{harvnb|Chen and Pei|429|loc={{strong|26}} }}: "後數日，亮盛兵西行，諸將皆謂欲攻西圍，淮獨以為此見形於西，欲使官兵重應之，必攻陽遂耳。其夜果攻陽遂，有備不得上。"</ref>

One night, Sima Yi saw a meteor falling towards the Shu camp and predicted Zhuge Liang would be defeated. He ordered a surprise attack on the Shu camp from behind; 500 Shu soldiers were killed, 600 surrendered, and Wei forces captured more than 1,000 livestock of the Shu army.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "會有長星墜亮之壘，帝知其必敗，遣奇兵掎亮之後，斬五百餘級，獲生口千餘，降者六百餘人。"</ref> This account, which comes from the ''Book of Jin'', is not included in the ''Zizhi Tongjian''. Rather, the accounts from the ''Records of the Three Kingdoms''<ref>{{harvnb|Chen and Pei|429|loc={{strong|26}} }}: "淮曰：「若亮跨渭登原，連兵北山，隔絕隴道，搖盪民、夷，此非國之利也。」宣王善之，淮遂屯北原。塹壘未成，蜀兵大至，淮逆擊之。"</ref> were included in the ''Zizhi Tongjian''.<ref>{{harvnb|Sima|1084|loc=vol. 72}}: "雍州刺史郭淮言於懿曰：「亮必爭北原，宜先據之。」議者多謂不然，淮曰：「若亮跨渭登原，連兵北山，隔絕隴道，搖盪民夷，此非國之利也。」懿乃使淮屯北原。塹壘未成，漢兵大至，淮逆擊卻之。"</ref>

The Wei government observed because the Shu army was far away from its base at [[Hanzhong Commandery]], it would not be in its interest to fight a prolonged war in enemy territory so it would be better for the Wei army to adopt a defensive posture against the Shu invaders. Cao Rui thus ordered Sima Yi to hold his position and refrain from engaging the Shu forces in battle. Zhuge Liang attempted to lure Sima Yi to attack him; on one occasion, Zhuge Liang sent Sima Yi women's ornaments to taunt him.{{sfnp|Sima|1084|loc=vol. 72}} Sima Yi, apparently feeling enraged, sought permission from Cao Rui to attack the enemy but this was denied. The emperor sent [[Xin Pi]], bearing the imperial sceptre—a symbol of the emperor's authority—to the battlefield to make sure Sima Yi followed orders and remained in camp.<ref>{{harvnb|Watanabe|2006|p=270}}; {{harvnb|Sima|1084|loc=vol. 72}}.</ref> Zhuge Liang knew Sima Yi was pretending to be angry because he wanted to show the Wei soldiers he would not put up with the enemy's taunting and to ensure the Wei soldiers were ready for battle.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "時朝廷以亮僑軍遠寇，利在急戰，每命帝持重，以候其變。亮數挑戰，帝不出，因遺帝巾幗婦人之飾。帝怒，表請決戰，天子不許，乃遣骨鯁臣衞尉辛毗杖節為軍師以制之。後亮復來挑戰，帝將出兵以應之，毗杖節立軍門，帝乃止。初，蜀將姜維聞毗來，謂亮曰：「辛毗杖節而至，賊不復出矣。」亮曰：「彼本無戰心，所以固請者，以示武於其衆耳。將在軍，君命有所不受，苟能制吾，豈千里而請戰邪！」"{{pb}}{{harvnb|Sima|1084|loc=vol. 72}}.</ref>

According to the ''Book of Jin'', when [[Sima Fu]] wrote to his brother Sima Yi to ask about the situation at Wuzhang Plains, Sima Yi replied: "Zhuge Liang has big ambitions but fails to recognise opportunities. Always scheming but indecisive, he dallies impotently at combat. Though in command of 100,000 troops, he has played right into my plans and faces certain defeat."<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "帝弟孚書問軍事，帝復書曰：「亮志大而不見機，多謀而少決，好兵而無權，雖提卒十萬，已墮吾畫中，破之必矣。」"</ref> When Zhuge Liang's envoy visited Sima Yi's camp, the latter inquired about his adversary's sleeping and eating habits, and how busy he was. When told how Zhuge Liang consumed little and did not sleep much, Sima Yi said to his men: "Zhuge Kongming takes little food and does much work; how can he last long?"{{sfnp|Sima|1084|loc=vol. 72}}

According to at least one source, Sima Yi continued to provoke Zhuge Liang. Sima Yi reportedly made some 2,000 people cheer by the south-east corner of the military compound. When Zhuge Liang sent a man to inquire on the situation, he stated: "[[Eastern Wu]]'s envoy came and said he would surrender." Zhuge Liang responded: "Eastern Wu will not surrender. Sima Yi is an old man who will soon be 60 years old, does he really need to use such a trick?"<ref>{{harvnb|Du, ''Tongdian''|801|loc=vol. 150}}: "宣王使二千餘人，就軍營東南角，大聲稱萬歲。亮使問之，答曰：「吳朝有使至，請降。」亮謂曰：「計吳朝必無降法。卿是六十老翁，何煩詭誑如此？」"</ref>

After a standoff lasting more than 100 days, Sima Yi heard from civilians Zhuge Liang had died from illness and the Shu army had burnt down their camp and retreated. He then led his troops to pursue the enemy and caught up with them but withdrew when the Shu forces got into battle formation. Some days later, Sima Yi surveyed the remains of the Shu camp and said; "He was a genius".{{sfnp|Sima|1084|loc=vol. 72}} He also concluded Zhuge Liang was indeed dead when he saw the Shu army had hastily retreated. [[Xin Pi]] felt they could not yet be certain about Zhuge Liang's death but Sima Yi said: "The most important things in an army are its documents, troops, horses, and supplies. [Zhuge Liang] has abandoned all of them. How can a person lose his five most important organs and still be alive? We should quickly pursue (the enemy)." The ground in the [[Guanzhong]] region was full of ''[[Tribulus terrestris]]'' – a ground level plant with spiky burrs – so Sima Yi sent 2,000 men wearing wooden clogs with flat soles to clear the path before his main army advanced and continued pursuing the enemy, although he retreated when he encountered the Shu forces.{{sfnp|Sima|1084|loc=vol. 72}} When Sima Yi reached Chi'an ({{lang|zh|赤岸}}), he asked the residents there about Zhuge Liang and heard there was a saying: "A dead Zhuge scares away a living Zhongda".{{efn|"Zhongda" was Sima Yi's [[courtesy name]].}} When Sima Yi heard that, he laughed and said: "That's because I can predict the living; I can't predict the dead."<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "與之對壘百餘日，會亮病卒，諸將燒營遁走，百姓奔告，帝出兵追之。亮長史楊儀反旗鳴皷，若將距帝者。帝以窮寇不之逼，於是楊儀結陣而去。經日，乃行其營壘，觀其遺事，獲其圖書、糧穀甚衆。帝審其必死。 ...追到赤岸，乃知亮死審問。時百姓為之諺曰：「死諸葛走生仲達。」帝聞而笑曰：「吾便料生，不便料死故也。」"{{pb}}{{harvnb|Sima|1084|loc=vol. 72}}.</ref>

In 235, Sima Yi was promoted to [[Grand Commandant]] and had the number of taxable households in his marquisate increased. In the same year, when the Shu general [[Ma Dai]] led troops to invade Wei, Sima Yi sent [[Niu Jin]] to lead Wei forces to resist the invaders. Niu Jin defeated Ma Dai and killed more than 1,000 enemy soldiers.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "三年，遷太尉，累增封邑。蜀將馬岱入寇，帝遣將軍牛金擊走之，斬千餘級。"</ref> However, this account from the ''Book of Jin'' is not referenced in the ''Zizhi Tongjian''. When a famine broke out in [[North China Plain]], Sima Yi had more than five million [[Chinese units of measurement#Volume|''hu'']]{{efn|Five million ''hu'' is nearly ten km<sup>3</sup>, and would require close to 13,000 modern [[intermodal container|intermodal shipping containers]] to accommodate.<ref>{{cite journal
| author-link= Michael Loewe
| last = Loewe | first = Michael
| title= The Measurement of Grain during the Han Period
| journal= T'oung Pao | series=Second Series | volume= 49 | issue= 1/2 | date= 1961 | pages= 64–95 | publisher= Brill | jstor = 4527501
| doi = 10.1163/156853262X00020
}}</ref>{{rp|65}} }} of grain transported from [[Chang'an]] to Luoyang to aid in disaster relief efforts.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "關東饑，帝運長安粟五百萬斛輸于京師。"</ref>

Around this time, Sima Yi established a military market at Chang'an. When an official named [[Yan Fei]] ({{lang|zh|顏斐}}) reported that the soldiers were insulting the people living there, he summoned the market captain and personally flogged him 100 times in front of Yan Fei,<ref>"Sīmǎ [Yì] Xuān-wáng at Cháng'ān established a military market, and in the army many of the soldiers encroached on and insulted the county's people, and [Yán] Fěi reported this to [Sīmǎ Yì] Xuān-wáng. [Sīmǎ Yì] Xuān-wáng therefore angrily summoned the military market captain, and in front of [Yán] Fěi flogged him with one hundred strokes."
''[[Weilüe]]'' annotation in ''Sanguozhi'', vol.16 (biography of [[Cang Ci]]){{full citation needed|date=August 2023}}</ref> and thereafter strictly supervised the conduct of all the officials and soldiers.<ref>"[Sīmǎ Yì] Xuān-wáng therefore strictly controlled his officials and soldiers. From then afterward, the military camps and the prefectures and counties each obtained their share."
''[[Weilüe]]'' annotation in ''Sanguozhi'', vol.16 (biography of [[Cang Ci]]).{{full citation needed|date=August 2023}}</ref>

===Liaodong campaign===
{{main|Sima Yi's Liaodong campaign}}
[[File:Gongsun territory.png|thumb|upright=1.5|Gongsun-controlled territory (light green, approximate).]]

In 236, Sima Yi caught a white deer, which was regarded as an auspicious animal, and presented it to the Wei emperor [[Cao Rui]], who said: "When the [[Duke of Zhou]] assisted [[King Cheng of Zhou|King Cheng]] in governance, he presented white pheasants to the king. Now you are in charge of Shaanxi and you present a white deer. Isn't this a sign of loyalty, cooperation, long-lasting stability, and peace?"<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "四年，獲白鹿，獻之。天子曰：「昔周公旦輔成王，有素雉之貢。今君受陝西之任，有白鹿之獻，豈非忠誠協符，千載同契，俾乂邦家，以永厥休邪！」"</ref> Later, when Cao Rui asked for capable and virtuous men to be recommended to him, Sima Yi recommended [[Wang Chang (Three Kingdoms)|Wang Chang]].{{sfnp|Sima|1084|loc=vol. 73}}

[[Gongsun Yuan]], a warlord based in [[Liaodong Commandery]] who previously pledged allegiance to the Wei state, started a rebellion and declared independence, defeating the general [[Guanqiu Jian]] in an engagement.{{sfnp|Sima|1084|loc=vol. 73}}

In January 238, Cao Rui summoned Sima Yi to Luoyang to lead a campaign against Liaodong. When asked by the emperor how Gongsun Yuan would respond, Sima Yi stated he may either flee, resist, or defend his capital city; the final option being the worst choice, and the most likely to be used against Sima Yi after some initial resistance. When the emperor asked how long it would take, Sima Yi said he needed one year to lead the troops to Liaodong, to suppress the revolt, and to then return and repose.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "及遼東太守公孫文懿反，徵帝詣京師。 ...天子曰：「往還幾時？」對曰：「往百日，還百日，攻百日，以六十日為休息，一年足矣。」"{{pb}}{{harvnb|Sima|1084|loc=vol. 73}}.</ref> The Wei government had conscripted many men into military service or recruited them for manual labour to work on Cao Rui's palace construction and renovation projects. Sima Yi felt doing so would increase the burden on the common people and make them resent the Wei government so he advised Cao Rui to halt the projects and focus on dealing with more pressing issues.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "是時大修宮室，加之以軍旅，百姓饑弊。帝將即戎，乃諫曰：「昔周公營洛邑，蕭何造未央，今宮室未備，臣之責也。然自河以北，百姓困窮，外內有役，勢不並興，宜假絕內務，以救時急。」"</ref>

Thereafter, Sima Yi, with [[Niu Jin]] and [[Hu Zun]] ({{lang|zh|胡遵}}) serving as his subordinates, set out with an army of 40,000 men from Luoyang to attack Liaodong.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "景初二年，帥牛金、胡遵等步騎四萬，發自京都。"<br />"In the 2nd Year of Jingchu ["Viewing the beginning", 238 AD], he, commanding Niu Jin, Hu Zun, and others, with forty thousand foot and horse, set out from the capital.</ref> Cao Rui saw him off at Luoyang's Ximing Gate ({{lang|zh-hant|西明門}}), where he ordered Sima Yi's brother [[Sima Fu]] and son [[Sima Shi]], as well as other officials to attend the ceremony.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "車駕送出西明門。"</ref> During the extensive and lively festivities, in which Sima Yi met with elders and old friends, he began sighing and, feeling emotional and dissatisfied, sang a song:
{| class="toccolours" style="width:70%; margin:10px;"
! style="width:112px" |
! 
|-
|<poem>{{lang|lzh|
天地開闢，
日月重光。
遭遇際會，
畢力遐方。
將掃羣穢，
還過故鄉。
肅清萬里，
總齊八荒。
告成歸老，
待罪舞陽。}}<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}</ref>
</poem>
|<poem>
Heaven and Earth unfold and open up,
(the) Sun and Moon are very bright.
Coming to a border meeting, 
a final effort in distant lands.
(I am) about to seep away the dirty pack, returning to pass by the old hometown.
Respectful and pure for ten thousand [[Li (unit)|''li'']], 
all equally in every direction.
Announcing success and returning in old age, awaits not in (my fief of) Wuyang.
</poem>
|}

Sima Yi advanced with the army, which would later be reinforced by Guanqiu Jian's forces in [[You Province]],<ref><!-- uh oh -->Chen Shou, 28.5.</ref> which included the Xianbei auxiliary led by [[Mohuba]], ancestor of the [[Murong]] clan.<ref name="g169">{{harvnb|Gardiner|1972b|p= 169}}.</ref> The Wei army reached Liaodong in June 238{{sfnp|Sima|1084|loc=vol. 73}} and as Sima Yi had anticipated, Gongsun Yuan had sent his Grand General Bei Yan ({{lang|zh|卑衍}}) and Yang Zuo ({{lang|zh-hant|楊祚}}) to face him. They built their camps along the Liao River to await Sima Yi's arrival. The Wei generals wanted to attack the enemy on the river's banks but Sima Yi reasoned attacking the encampment would only wear themselves out and deplete their valuable resources; because the bulk of the Liaodong army was at the Liao River, Gongsun Yuan's headquarters at [[Xiangping]], the capital of the Liaodong Commandery,{{sfnp|Watanabe|2006|p=278}} would be comparatively empty and the Wei army could take it with ease.<ref>{{harvnb|Sima|1084|loc=vol. 73}}.{{pb}}{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "帝曰：「賊堅營高壘，欲以老吾兵也。攻之，正入其計， ...古人曰，敵雖高壘，不得不與我戰者，攻其所必救也。賊大衆在此，則巢窟虛矣。我直指襄平，必人懷內懼，懼而求戰，破之必矣。」"<br />"The traitors have strong encampments and tall ramparts, desiring accordingly to wear out my troops. To attack them, that is to follow their plan. This is like Wang Yi going beyond [[Battle of Kunyang|Kunyang]] due to shame. The ancients said: the enemy though he has lofty walls, will not manage to not fight with us. Attack his places [and he will] surely [come] to help. If the traitors' great multitude is here, then the den is empty. If we head straight for Xiangping, then people will fear in their breasts. Fearful yet seeking battle, breaking them is certain."</ref>

Sima Yi decided to dispatch Hu Zun with a contingent of his army south with banners and drums to indicate he was going to make a sortie there with a large force.{{sfnp|Sima|1084|loc=vol. 73}} This deceived Bei Yan and his men, who pursued the decoy unit, whereby Hu Zun, having lured the enemy, crossed the river and broke through Bei Yan's line.{{sfnp|Gardiner|1972b|p=168}} Sima Yi secretly crossed the river to the north, sank the boats, burnt down the bridges, built a long barricade along the river, and then marched for the capital.{{sfnp|Sima|1084|loc=vol. 73}} Once the opposing generals realised they had fallen for a ruse, they started marching in haste towards the capital. In the night, while heading north to intercept Sima Yi as had been expected of them,<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "遂整陣而過。賊見兵出其後，果邀之。帝謂諸將曰：「所以不攻其營，正欲致此，不可失也。」"<br />"He thereupon ordered the columns and went beyond. The traitors saw the troops setting out to their rear, and as a result intercepted them. The Emperor spoke to the various generals, saying: 'By not attacking their encampments, my principal desire was to cause this. We cannot lose.'"</ref> they caught up at Mount Shou ({{lang|zh|首山}}; a mountain west of Xiangping), where Bei Yan was ordered to give battle, and was subsequently defeated by Sima Yi and his army.<ref>{{harvnb|Sima|1084|loc=vol. 73}}.{{pb}}{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "乃縱兵逆擊，大破之，三戰皆捷。賊保襄平，進軍圍之。"<br />"He then let loose the soldiers to confront and strike, greatly routing them, there were three battles and all were won. The traitors guarded Xiangping. He advanced the army to besiege them."</ref> Sima Yi then marched towards Xiangping unopposed, and started besieging it.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "帝盛兵多張旗幟出其南，賊盡銳赴之。乃泛舟潛濟以出其北，與賊營相逼，沉舟焚梁，傍遼水作長圍，棄賊而向襄平。諸將言曰：「不攻賊而作圍，非所以示衆也。」"</ref>

July brought the summer monsoons, which a year earlier had impeded Guanqiu Jian's campaign. Heavy ran fell for more than a month so even ships could sail the length of the flooded Liao River from its mouth at [[Liaodong Bay]] up to the walls of Xiangping. Despite the water being several feet high on level ground, Sima Yi was determined to maintain the siege regardless of the clamours of his officers, who proposed changing camps. Sima Yi threatened to execute those who advocated for the idea, such as the officer Zhang Jing, who violated the order. The rest of the officers subsequently became silent.{{sfnp|Sima|1084|loc=vol. 73}}

Because of the floods, the encirclement of Xiangping was incomplete and the defenders used the flood to their advantage to sail out to forage and pasture their animals. Sima Yi forbade his generals from pursuing the foragers and herders from Xiangping,<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "會霖潦，大水平地數尺，三軍恐，欲移營。帝令軍中敢有言徙者斬。都督令史張靜犯令，斬之，軍中乃定。賊恃水，樵牧自若。諸將欲取之，皆不聽。"</ref> and upon being questioned by one of his subordinates, stated: "[[Meng Da]]'s multitudes were small, but he had food and supplies for a year. My generals and soldiers were four times those of Da, but with provisions not even for a full month. Using one month to plot against one year, how could I not be quick? To use four to strike against one, if it merely makes half be eliminated, I would still do it. In this case, I consider not calculations on death and injuries, I compete against provisions. Now, the rebels are numerous and we are few; the rebels are hungry and we are full. With flood and rain like this, we cannot employ our effort. Even if we take them, what is the use? Since I left the capital, I have not worried about the rebels attacking us, but have been afraid they might flee. Now, the rebels are almost at their extremity as regards supplies, and our encirclement of them is not yet complete. By plundering their cattle and horses or capturing their fuel-gatherers, we will be only compelling them to flee. War is an art of deception; we must be good at adapting ourselves to changing situations. Relying on their numerical superiority and helped by the rain, the rebels, hungry and distressed as they are, are not willing to give up. We must make a show of inability to put them at ease; to alarm them by taking petty advantages is not the plan at all."<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "帝曰：「孟達眾少而食支一年，吾將士四倍于達而糧不淹月，以一月圖一年，安可不速？以四擊一，正令半解，猶當為之。是以不計死傷，與糧競也。今賊眾我寡，賊飢我飽，水雨乃爾，功力不設，雖當促之，亦何所為。自發京師，不憂賊攻，但恐賊走。今賊衆我寡，賊飢我飽，水雨乃爾，功力不設，雖當促之，亦何所為。自發京師，不憂賊攻，但恐賊走。今賊糧垂盡，而圍落未合，掠其牛馬，抄其樵采，此故驅之走也。夫兵者詭道，善因事變。賊憑衆恃雨，故雖飢困，未肯束手，當示無能以安之。取小利以驚之。非計也。」"{{pb}}{{harvnb|Sima|1084|loc=vol. 73}}.</ref>

Officials in the Wei imperial court in Luoyang were also concerned about the floods and proposed recalling Sima Yi. The Wei emperor, Cao Rui, being certain of Sima Yi's abilities, turned down the proposal.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "朝廷聞師遇雨，咸請召還。天子曰：「司馬公臨危制變，計日擒之矣。」"{{pb}}{{harvnb|Sima|1084|loc=vol. 73}}.</ref> Around this time, the [[Goguryeo]] king sent a noble ({{lang|ko-Hani|大加}}; ''taeka'') and the Keeper of Records ({{langn|ko-Hani|主簿}} ''jubu'') of the Goguryeo court with several thousand men to aid Sima Yi.<ref>{{harvnb|Gardiner|1972b| pp= 165, 169}}. The names of these leaders of the Goguryeo expeditionary force were not recorded.</ref>

On 3 September, a comet was seen in the skies of Xiangping and was interpreted as an omen of destruction by those in the Liaodong camp. A frightened Gongsun Yuan sent his Chancellor of State Wang Jian ({{lang|zh|王建}}) and Imperial Counsellor Liu Fu ({{lang|zh|柳甫}}) to negotiate the terms of surrender, where he promised to present himself bound to Sima Yi once the siege was lifted. Sima Yi, wary of Gongsun Yuan's double-crossing past, executed the two, saying in a message to Gongsun Yuan he desired an unconditional surrender: "In ancient times, [[Chu (state)|Chu]] and [[Zheng (state)|Zheng]] were classed as states of equal footing, yet the Earl of Zheng nevertheless met the Prince of Chu with his flesh bare and leading a sheep. I am a superior Ducal Minister of the Son of Heaven, yet Wang Jian and his following wanted me to raise the siege and withdraw my men. Is this proper? These two men were dotards who must have failed to convey your intentions; I have already put them to death (on your behalf). If you still have anything to say, then send a younger man of intelligence and precision."<ref>{{harvnb|Gardiner|1972b| p= 171}}; {{harvnb|Sima|1084|loc=vol. 73}}.{{pb}}{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "時有長星，色白，有芒鬣，自襄平城西南流于東北，墜于梁水，城中震慴。文懿大懼，乃使其所署相國王建、御史大夫柳甫乞降，請解圍面縛。不許，執建等，皆斬之。檄告文懿曰：「昔楚鄭列國，而鄭伯猶肉袒牽羊而迎之。孤為主人，位則上公，而建等欲孤解圍退舍，豈楚鄭之謂邪！二人老耄，必傳言失旨，已相為斬之。若意有未已，可更遣年少有明決者來。」文懿復遣侍中衞演乞剋日送任。"</ref>

When Gongsun Yuan sent Wei Yan ({{lang|zh|衛演}}) for another round of talks, this time asking permission to send a hostage to the Wei court, Sima Yi dismissed the final messenger as a waste of time: "In military affairs there are five essential points. If able to fight, you must fight. If not able to fight, you must defend. If not able to defend, you must flee. The remaining two points entail only surrender or death. Now that you are not willing to come bound, you are determined to have death; there is no need of sending any hostage."<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "帝謂演曰：「軍事大要有五，能戰當戰，不能戰當守，不能守當走，餘二事惟有降與死耳。汝不肯面縛，此為決就死也，不須送任。」"{{pb}}{{harvnb|Sima|1084|loc=vol. 73}}.</ref> Sima Yi's previous suggestion of further negotiations was an act of malice that gave false hope to Gongsun Yuan while prolonging the siege and placing further strain on the supplies within the city.{{sfnp|Gardiner |1972b| pp= 172, 195 n. 94}}

When the rain stopped and the floodwater receded, Sima Yi hastened to complete the encirclement of Xiangping. The siege continued day and night using [[Mining (military)|mining]], hooked ladders, [[battering ram]]s, and artificial mounds for [[siege tower]]s and [ to get higher vantage points.<ref name="g169"/><ref>{{harvnb|Sima|1084|loc=vol. 73}}.{{pb}}{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "既而雨止，遂合圍。起土山地道，楯櫓鈎橦，發矢石雨下，晝夜攻之。"</ref> The speed at which the siege was tightened caught the defenders off guard; because they had been obtaining supplies with such ease during the flood, there was apparently no real attempt to stockpile the goods inside Xiangping. As a result, famine and cannibalism broke out in the city. Many Liaodong generals, such as Yang Zuo, surrendered to Sima Yi during the siege.{{sfnp|Sima|1084|loc=vol. 73}}

On 29 September, the famished Xiangping fell to the Wei army. Gongsun Yuan and his son Gongsun Xiu ({{lang|zh-hant|公孫脩}}), leading a few hundred horsemen, broke out of the encirclement and fled to the southeast. The main Wei army gave pursuit, and killed both father and son on the Liang River ({{lang|zh|梁水}}; now known as [[Taizi River]]).<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "文懿攻南圍突出，帝縱兵擊敗之，斬于梁水之上星墜之所。"{{pb}}{{harvnb|Sima|1084|loc=vol. 73}}.</ref> Gongsun Yuan's head was cut off and sent to Luoyang for public display. A separate fleet led by future Grand Administrators Liu Xin ({{lang|zh-hant|劉昕}}) and Xianyu Si ({{lang|zh|鮮于嗣}}) had been sent to attack the Korean commanderies of [[Lelang Commandery|Lelang]] and [[Daifang Commandery|Daifang]] by sea. Eventually, all of Gongsun Yuan's former holdings were subjugated.<ref>{{cite journal| last= Ikeuchi | first= Hiroshi | title=A Study on Lo-lang and Tai-fang, Ancient Chinese prefectures in Korean Peninsula | journal=Memoirs of the Research Department of the Toyo Bunko |volume= 5 |date=1930|pages= 79–95}}</ref>{{rp|87–88}}

After Sima Yi's army occupied Xiangping, he erected a pair of guideposts to separate recent and long-serving government officials, and military personnel of Gongsun Yuan's disestablished regime, and ordered a systematic purge of 2,000 officials. He also had some 7,000 men aged 15 and above from within the city executed and raised a ''jingguan'' ({{lang|zh|京觀}}, a victory mound) with their corpses while pardoning the remaining survivors.<ref>{{harvnb|Sima|1084|loc=vol. 73}}.{{pb}}{{harvnb|Fang|1952}}: "Having entered the city, he set up two standards to distinguish recent and long-time rebels. Males above fifteen years old, more than seven thousand men, were all put to death and used to form the Jingguan. The ducal and other ministers and the lower officials of the rebels were all put to death. Also put to death were the generals Bi Sheng and others—more than two thousand men. Forty thousand households, consisting of three hundred and several ten thousands of persons, were gained."</ref> In total, Sima Yi's conquest gained Wei an additional 40,000 households and over 300,000 citizens,<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "文懿攻南圍突出，帝縱兵擊敗之，斬于梁水之上星墜之所。既入城，立兩標以別新舊焉。男子年十五已上七千餘人皆殺之，以為京觀。偽公卿已下皆伏誅，戮其將軍畢盛等二千餘人。收戶四萬，口三十餘萬。"</ref> although Sima Yi did not encourage these frontier settlers to continue their livelihoods in the Chinese northeast; he ordered those families who wished to return to central China be allowed to do so. Sima Yi also posthumously rehabilitated and erected mounds over the graves of Lun Zhi ({{lang|zh|倫直}}) and Jia Fan ({{lang|zh|賈範}}), two officials who had attempted to stop Gongsun Yuan from rebelling but were executed by him. Sima Yi also freed [[Gongsun Gong]], the previous Administrator of Liaodong, who had been imprisoned by his nephew Gongsun Yuan. All of this was carried out under an order that stated: "During the ancients' attacks on states, they executed their fiercest enemies,{{efn|Literally: "whales" ({{lang|zh|鯨鯢}})}} and that was all. Those who were deceived and misled by Wenyi, all are forgiven. People of the Central States who desire to return to their old hometowns are free to do so."<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "初，文懿篡其叔父恭位而囚之。及將反，將軍綸直、賈範等苦諫，文懿皆殺之。帝乃釋恭之囚，封直等之墓，顯其遺嗣。"{{pb}}{{harvnb|Sima|1084|loc=vol. 73}}.</ref>

Because it was winter, many soldiers were suffering from the cold and wanted extra clothing. When someone said they had a surplus of [[Ruqun|''ru'']] and suggested giving them to the soldiers, Sima Yi said: "The padded coats are the property of the government. No one is allowed to give them to others without permission." Sima Yi ordered all soldiers aged 60 and above, numbering over 1,000 men, to retire from their service, and for the dead and wounded to be sent home.{{sfnp|Sima|1084|loc=vol. 73}} As Sima Yi led the troops back to Luoyang from Liaodong, Cao Rui sent an emissary to meet them in [[Jicheng (Beijing)|Ji]] and host a victory celebration. He also added Kunyang County ({{lang|zh|昆陽縣}}; present-day [[Ye County]], Henan) to Sima Yi's marquisate so Sima Yi had two counties as his marquisate.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "時有兵士寒凍，乞襦，帝弗之與。或曰：「幸多故襦，可以賜之。」帝曰：「襦者官物，人臣無私施也。」乃奏軍人年六十已上者罷遣千餘人，將吏從軍死亡者致喪還家。遂班師。天子遣使者勞軍于薊，增封食昆陽，并前二縣。"</ref>

===Appointment as regent===
When Sima Yi arrived at Xiangping, he dreamt Cao Rui asked him to look at his face, which appeared different than usual, and Sima Yi sensed something was wrong.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "初，帝至襄平，夢天子枕其膝，曰：「視吾面。」俛視有異於常，心惡之。"<br />"Earlier, when the Emperor arrived at Xiangping, he dreamt that the Son of Heaven was on a pillow on his knees, and said: "Look at my face". He looked down and saw he was different than usual. His heart was sick."</ref> Later, when Sima Yi was in Ji County ({{lang|zh|汲縣}}; in present-day [[Xinxiang, Henan]]), Cao Rui issued an imperial order instructing him to return to Luoyang via a faster route through the [[Guanzhong]] region. When Sima Yi reached Baiwu ({{lang|zh|白屋}}), he received another five orders within three days.{{sfnp|Sima|1084|loc=vol. 74}} Sensing the urgency of the situation, he boarded a ''zhuifengche''{{efn|A ''zhuifengche'' ({{lang|zh|追鋒車}}) was a light, fast-moving horse-drawn carriage or chariot. See the [http://cidian.wenku1.com/%E8%BF%BD%E9%94%8B%E8%BD%A6/ dictionary definition].}} and travelled overnight across the Baiwu region over a distance of more than 400 [[Li (unit)|''li'']], stopping only once for a brief rest, and reached Luoyang the following day. Upon arrival, Sima Yi was led to the bedroom of the Jiafu Hall ({{lang|zh|嘉福殿}}) in the imperial palace to meet Cao Rui and saw the emperor was critically ill. With tears in his eyes, Sima Yi asked Cao Rui about his condition. Cao Rui held Sima Yi's hand and told him: "I have matters to entrust you. Now that I meet you one last time before I die, I have no more regrets."<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "帝大遽，乃乘追鋒車晝夜兼行，自白屋四百餘里，一宿而至。引入嘉福殿臥內，升御牀。帝流涕問疾，天子執帝手，目齊王曰：「以後事相託。死乃復可忍，吾忍死待君，得相見，無所復恨矣。」"<br />"He traveled by way stations for more than 400 li [about 160 km], and had just one stop before arriving. He was led into the bedroom in the Hall of Excellent Fortune [jia fu dian], and advanced to the imperial bed. The Emperor with flowing tears asked of the sickness. The Son of Heaven grasped the Emperor's hand, and looked at the King of Qi and said: 'For future affairs mutual support. Death therefore now may be endured. I have endured death awaiting your Lordship. Gaining each other's views, without resentment.'"</ref> Cao Rui called into his chambers the Prince of Qin, Cao Xun, and the Prince of Qi, Cao Fang, and while pointing towards Cao Fang stated: "This is he. Look at him carefully and do not make any mistake." Cao Rui had Cao Fang embrace Sima Yi's neck. Sima Yi hit his forehead on the floor and started weeping.{{sfnp|Sima|1084|loc=vol. 74}} Cao Rui thereafter designated Sima Yi as a co-regent for the young Cao Fang alongside the general [[Cao Shuang]], who had already been designated for the position.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "先是，詔帝便道鎮關中；及次白屋，有詔召帝，三日之間，詔書五至。手詔曰：「間側息望到，到便直排閤入，視吾面。」...命與大將軍曹爽並受遺詔輔少主。"</ref>

Before his death, Cao Rui had planned to exclude Sima Yi from the regency and instead appoint [[Cao Yu (Three Kingdoms)|Cao Yu]], Xiahou Xian ({{lang|zh|夏侯獻}}), Cao Shuang, [[Cao Xiu#Family|Cao Zhao]], and [[Qin Lang]] as the regents. Two of his close aides, Liu Fang ({{lang|zh-hant|劉放}}) and Sun Zi ({{lang|zh-hant|孫資}}), who were not on good terms with Xiahou Xian and Cao Zhao, persuaded Cao Rui to exclude those two, and Qin Lang and Cao Yu, thereby having Cao Shuang and Sima Yi appointed as the regents instead.<ref>{{harvnb|Sakaguchi|2005|p=204}}; {{harvnb|Sima|1084|loc=vol. 74}}.</ref>

==Service under Cao Fang==
In early 239, when [[Cao Fang]] became the new Wei emperor, the Wei government appointed Sima Yi as [[Palace Attendant]] and Manager of the Affairs of the Imperial Secretariat ({{lang|zh|錄尚書事}}), granted him imperial authority, and ordered him to oversee military affairs within and outside Luoyang. Sima Yi and [[Cao Shuang]] each held command over 3,000 troops, and served as regents for the underage emperor. Because Cao Shuang wanted the Masters of Writing (or Imperial Secretariat) to report to him first, he proposed to the imperial court to reassign Sima Yi to be the Grand Marshal ({{lang|zh-hant|大司馬}}). The previous Grand Marshals had all died in office so the imperial court thought it would be more appropriate to appoint Sima Yi as Grand Tutor ({{lang|zh|太傅}}) instead. Sima Yi was also awarded additional privileges similar to those granted to [[Xiao He]] in the early [[Western Han dynasty]] and Cao Cao in the late [[Eastern Han dynasty]]: He did not have to walk briskly when he entered the imperial court, did not have to have his name announced when he entered, and was allowed to wear shoes and carry a sword into the imperial court. His eldest son [[Sima Shi]] was appointed as a Regular Mounted Attendant ({{lang|zh|散騎常侍}}) while three of his relatives were enfeoffed as marquises and four others were appointed as Cavalry Commandants ({{lang|zh|騎都尉}}). Sima Yi ordered his relatives to decline the honours and appointments.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "及齊王即帝位，遷侍中、持節、都督中外諸軍、錄尚書事，與爽各統兵三千人，共執朝政，更直殿中，乘輿入殿。爽欲使尚書奏事先由己，乃言於天子，徙帝為大司馬。朝議以為前後大司馬累薨於位，乃以帝為太傅，入殿不趨，贊拜不名，劔履上殿，如漢蕭何故事。嫁娶喪葬取給於官，以世子師為散騎常侍，子弟三人為列侯，四人為騎都尉。帝固讓子弟官不受。"</ref>

In the spring of 239, the [[Wa (Japan)|Wa]], [[Karasahr]], Weixu ({{lang|zh|危須}}) states and the [[Xianbei]] tribes living south of the [[Ruo Shui|Ruo River]] came to pay tribute to the Cao Wei state. Cao Fang attributed this to the efforts of his subjects and he rewarded Sima Yi by increasing the number of taxable households in his marquisate.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "魏正始元年春正月，東倭重譯納貢，焉耆、危須諸國，弱水以南，鮮卑名王，皆遣使來獻。天子歸美宰輔，又增帝封邑。"</ref> Sima Yi also suggested the Wei imperial court put an end to the extravagant palace construction and renovation projects started in Cao Rui's reign, and divert those resources and manpower to agriculture. The imperial court approved.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "初，魏明帝好脩宮室，制度靡麗，百姓苦之。帝自遼東還，役者猶萬餘人，雕玩之物動以千計。至是皆奏罷之，節用務農，天下欣賴焉。"</ref>

===Battles in Jing Province===
{{see also|Eastern Wu campaign against Cao Wei (241)}}

Around late May or June 241, Wu launched an invasion of Wei on three fronts: Quebei ({{lang|zh|芍陂}}; south of present-day [[Shou County]], Anhui), [[Fancheng]], and Zhazhong ({{lang|zh|柤中}}; west of present-day [[Nanzhang County]], Hubei). When Sima Yi asked permission to lead troops to resist the enemy, officials in the imperial court argued there was no need to take swift action because Fancheng was strong enough to withstand attacks and because the enemy was weary after travelling a long distance. Sima Yi disagreed and said: "In Zizhong the Chinese people and the barbarians number a hundred thousand; south of the water they wander and roam without a master over them. Fancheng has been under attack more than a month without relief. This is a precarious situation. I ask to lead a campaign myself."<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "二年夏五月，吳將全琮寇芍陂，朱然、孫倫圍樊城，諸葛瑾、步騭掠柤中，帝請自討之。議者咸言，賊遠來圍樊，不可卒拔。挫於堅城之下，有自破之勢，宜長策以御之。帝曰：「邊城受敵而安坐廟堂，疆埸騷動，衆心疑惑，是社稷之大憂也。」"{{pb}}{{harvnb|Sima|1084|loc=vol. 74}}: "吳兵猶在荊州，太傅懿曰：「柤中民夷十萬，隔在水南，流離無主，樊城被攻，歷月不解，此危事也，請自討之。」"</ref>

In late June or July 241, Sima Yi led an army from Luoyang to fight the Wu invaders. The Wei emperor Cao Fang saw him off at Luoyang's Jinyang Gate ({{lang|zh-hant|津陽門}}). Upon reaching Fancheng, Sima Yi knew he should not linger for too long because of the heat of summer. He sent a lightly armed cavalry detachment to harass the Wu forces while his main army remained in position. Later, he ordered his tired troops to rest and bathe while a remaining group of personally chosen forces and enlisted volunteers were ordered to climb Fancheng's city walls to reinforce the city and curb the enemy's siege. The Wu forces led by [[Zhu Ran]] retreated overnight upon hearing of this. Sima Yi and the Wei forces pursued the retreating Wu forces to the confluence of the [[Han River (Hanshui)|Han]], Bai, and Tang rivers, where they defeated and killed over 10,000 enemy soldiers and captured their boats, equipment, and other resources.{{sfnp|Sima|1084|loc=vol. 74}} Cao Fang sent his Palace Attendant as an emissary to meet Sima Yi at Wan to congratulate him and host a banquet to celebrate the victory.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "六月，乃督諸軍南征，車駕送出津陽門。帝以南方暑溼，不宜持久，使輕騎挑之，然不敢動。於是休戰士，簡精銳，募先登，申號令，示必攻之勢。吳軍夜遁走，追至三州口，斬獲萬餘人，收其舟船軍資而還。天子遣侍中常侍勞軍于宛。"</ref>

In August 241, the Wei imperial court added two counties to Sima Yi's marquisate as a reward for his contributions; Sima Yi's marquisate now spanned four counties and covered 10,000 taxable households. Eleven of Sima Yi's relatives were also enfeoffed as marquises. As Sima Yi gained greater glory for his achievements, he behaved in a more humble manner,  He also constantly reminded his siblings, children, and younger relatives to be mindful of their conduct.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "秋七月，增封食郾、臨潁，并前四縣，邑萬戶，子弟十一人皆為列侯。帝勳德日盛，而謙恭愈甚。以太常常林鄉邑舊齒，見之每拜。恒戒子弟曰：「盛滿者道家之所忌，四時猶有推移，吾何德以堪之。損之又損之，庶可以免乎！」"</ref> In early 242, Cao Fang bestowed the posthumous title "Marquis Cheng of Wuyang" ({{lang|zh|舞陽成侯}}) upon Sima Yi's deceased father [[Sima Fang]].<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "三年春，天子追封謚皇考京兆尹為舞陽成侯。"</ref>

===Promoting agriculture in the Huai River region===
According to the ''Book of Jin'', in April or May 242, Sima Yi proposed to the Wei government the digging of a canal to connect the [[Yellow River|Yellow]] and [[Bian River (China)|Bian]] rivers and direct their waters towards the southeast to promote agriculture north of the [[Huai River]].<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "三月，奏穿廣漕渠，引河入汴，溉東南諸陂，始大佃於淮北。"</ref>

An account from the ''Zizhi Tongjian'' places this event somewhere in 241; in this account, [[Deng Ai]] proposed the idea of building such a canal to Sima Yi, who only thereafter petitioned the state. The agricultural project was begun and eventually completed, and whenever there was a battle in the southeast between the Wei and Wu armies, Wei troops could quickly travel downstream towards the Huai River to counter the enemy. The abundance of food resources and waterways in the upper stream were advantageous for the Wei forces.<ref>{{harvnb|Chen and Pei|429|loc={{strong|28}} }}: "正始二年，乃開廣漕渠，每東南有事，大軍興衆，汎舟而下，達于江、淮，資食有儲而無水害，艾所建也。"{{pb}}{{harvnb|Sima|1084|loc=vol. 74}}: "朝廷欲廣田畜穀於揚、豫之間，使尚書郎汝南鄧艾行陳、項已東至壽春。艾以為：「昔太祖破黃巾，因為屯田，積穀許都以制四方。今三隅已定，事在淮南，每大軍出征，運兵過半，功費巨億。陳、蔡之間，土下田良，可省許昌左右諸稻田，并水東下，令淮北屯二萬人，淮南三萬人，什二分休，常有四萬人且田且守；益開河渠以增溉灌，通漕運。計除眾費，歲完五百萬斛以為軍資，六、七年間，可積三千萬斛於淮上，此則十萬之眾五年食也。以此乘吳，無不克矣。」太傅懿善之。是歲，始開廣漕渠，每東南有事，大興軍眾，汎舟而下，達于江、淮，資食有儲而無水害。"</ref>

Around that time, the Wu general [[Zhuge Ke]] was stationed at a military garrison at Wan ({{lang|zh|皖}}; near [[Qianshan County]], Anhui) and posed a threat to the Wei forces in the region. When Sima Yi wanted to lead troops to attack Zhuge Ke, many officials advised him against it. They said Wan was heavily fortified and abundant in supplies, and that Wu reinforcements would come to Zhuge Ke's aid if he came under attack, thus putting the invaders in a perilous position. Sima Yi disagreed and said: "The enemy's strength is in naval warfare. Why don't we try attacking their land garrison and gauge their reaction? If they know their strengths, they will abandon the garrison and retreat; this is our objective. If they hold up inside the garrison and defend their position, their reinforcements will have to reach them via land because the waters are too shallow in winter for boats to sail through. They will be forced to abandon their strength and act from their weakness, to our benefit."<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "先是，吳遣將諸葛恪屯皖，邊鄙苦之，帝欲自擊恪。議者多以賊據堅城，積穀，欲引致官兵。今懸軍遠攻，其救必至，進退不易，未見其便。帝曰：「賊之所長者水也，今攻其城，以觀其變。若用其所長，棄城奔走，此為廟勝也。若敢固守，湖水冬淺，船不得行，勢必棄水相救，由其所短，亦吾利也。」"</ref>

In October 243, Sima Yi led an army from Luoyang to attack Zhuge Ke at Wan. When Sima Yi and his army reached Shu County ({{lang|zh|舒縣}}; near [[Shucheng County]], Anhui), Zhuge Ke, upon being instructed by Sun Quan to not give battle and instead station at Chaisang ({{lang|zh|柴桑}}), gave orders to burn the supplies stockpiled in Wan, abandon the garrison, and retreat.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "四年秋九月，帝督諸軍擊諸葛恪， ...軍次于舒，恪焚燒積聚，棄城而遁。"{{pb}}{{harvnb|Sima|1084|loc=vol. 74}}.</ref>

Sima Yi's aim was to destroy the Wu forces' sources of food in the Huai River region so once Zhuge Ke burnt the supplies in Wan, Sima Yi felt more at ease. He then implemented the ''[[tuntian]]'' policy of agricultural military colonies, alongside large-scale agricultural and irrigation works in the region.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "帝以滅賊之要，在於積穀，乃大興屯守，廣開淮陽、百尺二渠，又脩諸陂於潁之南北，萬餘頃。自是淮北倉庾相望，壽陽至于京師，農官屯兵連屬焉。"{{pb}}{{harvnb|Sima|1084|loc=vol. 74}}.</ref> In late January or February 244, Cao Fang sent an emissary to meet Sima Yi at [[Huainan Commandery]] and honour him for his achievements in promoting agriculture in the region.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "五年春正月，帝至自淮南，天子使持節勞軍。"</ref>

===Struggle with Cao Shuang===
Throughout the early years of Cao Shuang and Sima Yi's co-regency, the former attempted to consolidate his political influence while only briefly paying respect to Sima Yi based on his status and seniority. Cao Shuang put his brothers in command of the military, promoted his close aides to higher positions in the imperial court, and made changes to the political structure to benefit himself and his clique. He also silenced those who stood against him, his associates, and their combined interests.{{sfnp|Sima|1084|loc=vol. 74}}

During this chain of events, Cao Shuang had Sima Yi appointed to the position of Grand Tutor under the guise of a promotion; while the position was an honourable one, it held almost no real authority and removed Sima Yi from the position of Manager of Affairs of the Imperial Secretariat, instead giving authority over the Secretariat to Cao Shuang. Through the careful appointing of some of Sima Yi's aides to certain positions, however, Sima Yi effectively retained much of his political influence and Cao Shuang's attempts at strengthening his grip on the political scene were somewhat mitigated. For instance, [[Deng Ai]], a man with whom Sima Yi had previously grown acquainted and realising his talent, transferred him into his service, was eventually appointed to the position of Prefect of the Imperial Secretariat ({{lang|zh|尚書郎}}) in 241,{{sfnp|Sima|1084|loc=vol. 74}}<ref>ZZTJ Zhengshi 2, 10</ref> gave Deng Ai the rank of Prefect of the Masters of Writing, allowing Sima Yi to still supervise the edicts and memorials. After the death of [[Man Chong]] in 242, one of Sima Yi's long-serving associates [[Jiang Ji]] was appointed to the position of Grand Commandant.{{sfnp|Sima|1084|loc=vol. 74}}<ref>ZZTJ Zhengshi 3, 4.</ref><!-- what do you mean by that, mysterious prior editor? -->

Throughout the 240s, as new groups of intellectuals largely headed by [[He Yan]], an associate of Cao Shuang, sought to oppose traditional Confucian principles and discard "pointless" formalities in society, Sima Yi became a leading representative of men from good families who sought to promote the traditional type of Confucian morality, and restraint in politics and society.{{sfnp|de Crespigny|2010|pp=460–461}}

In 244, the officials [[Deng Yang]] and [[Li Sheng (Three Kingdoms)|Li Sheng]] advised [[Cao Shuang]] to launch a military campaign against Shu to boost his fame and authority in Wei. Sima Yi strongly objected to this idea but Cao Shuang ignored him and proceeded with the campaign. In April 244, Cau Shuang was defeated by Shu forces at the [[Battle of Xingshi]].<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "尚書鄧颺、李勝等欲令曹爽建立功名，勸使伐蜀。帝止之，不可，爽果無功而還。"{{pb}}{{harvnb|Sakaguchi|2005|p=51}}; {{harvnb|Sima|1084|loc=vol. 74}}</ref> Sima Yi sent a letter to Cao Shuang's associate and uncle [[Xiahou Xuan]] reprimanding his faction's reckless actions because they could lead to destruction, referring to a historical precedent by stating Cao Cao almost suffered a total defeat in the war against Liu Bei for [[Hanzhong Campaign|Hanzhong]]. The letter also said Shu forces were already occupying Mount Xingshi ({{lang|zh|興勢山}}; north of [[Yang County]], Shaanxi), and if Cao Shuang's group failed to seize control of the area, they could have their retreat route cut off and their forces destroyed. Xiahou Xuan subsequently grew anxious and advised Cao Shuang to lead back his troops, which he eventually did by June or July of the same year, incurring further losses during his retreat.{{sfnp|Sima|1084|loc=vol. 74}}

In September 245, Cao Shuang wanted to alter the structure of the military so he could put his brothers Cao Xi ({{lang|zh|曹羲}}) and Cao Xun ({{lang|zh|曹訓}}) in command of troops. Sima Yi opposed these changes but Cao Shuang ignored him and went ahead.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "六年秋八月，曹爽毀中壘中堅營，以兵屬其弟中領軍羲。帝以先帝舊制禁之，不可。"</ref> In January 246, the Wei emperor [[Cao Fang]] granted Sima Yi the privilege of riding to the imperial court in a type of horse-drawn carriage that was traditionally reserved for emperors.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "冬十二月，天子詔帝朝會乘輿升殿。"</ref>

In February 246, when Wu forces attacked Zhazhong, over 10,000 households living there fled to the north across the Mian River ({{lang|zh|沔水}}, a historical name for the Han River). When news of the Wu invasion reached the Wei imperial court, Sima Yi argued they should let the civilians remain on the northern side of the river because the southern side was near enemy territory and hence too dangerous for them. Cao Shuang, however, said: "It isn't in our long-term interests to allow the civilians to remain here and give up trying to secure the south of the Mian River". Sima Yi disagreed: "No. In every case, a safe place is safe, and a dangerous place is dangerous. Hence the military manuals state: 'Victory and defeat are manifestations; safety and danger are energies.' Manifestation of energy, from the emperor on down, this affects everyone. One cannot but take care about it. Suppose the enemy sends 20,000 troops to cut off passage across the Mian River, sends another 30,000 troops to fight our forces at the south of the Mian, and sends another 10,000 troops to occupy Zhazhong. What then can we do to save those civilians?" Cao Shuang refused and ordered the refugees to return to the southern side of the Mian River. As Sima Yi foresaw, Wu forces occupied Zhazhong, captured the civilians, and relocated them to Wu territory.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "七年春正月，吳寇柤中，夷夏萬餘家避寇北渡沔。帝以沔南近賊，若百姓奔還，必復致寇，宜權留之。曹爽曰：「今不能脩守沔南而留百姓，非長策也。」帝曰：「不然。凡物致之安地則安，危地則危。故兵書曰『成敗，形也；安危，勢也』。形勢，御衆之要，不可以不審。設令賊以二萬人斷沔水，三萬人與沔南諸軍相持，萬人陸梁柤中，將何以救之？」爽不從，卒令還南。賊果襲破柤中，所失萬計。"</ref>

Around late May or early June 247, Cao Shuang wanted to further dominate the Wei government so he used a series of political manoeuvres to consolidate and concentrate power in himself and his clique.<ref>{{harvnb|Watanabe|2006|p=280}}; {{harvnb|Sakaguchi|2005|pp=50, 162}}.</ref> He heeded the advice of his close aides [[He Yan]], [[Deng Yang]], and Ding Mi ({{lang|zh|丁謐}}), and relocated Cao Rui's widow [[Empress Guo (Cao Rui's wife)|Empress Dowager Guo]] to Yongning Palace ({{lang|zh-hant|永寧宮}}) so she could not interfere in politics.{{sfnp|Sima|1084|loc=vol. 75}} Sima Yi was unable to stop this, among other contrivances, putting severe stress on the relationship between him and Cao Shuang, who became increasingly distrustful and wary of Sima Yi.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "曹爽用何晏、鄧颺、丁謐之謀，遷太后於永寧宮，專擅朝政，兄弟並典禁兵，多樹親黨，屢改制度。帝不能禁，於是與爽有隙。"</ref><!-- At the time, there was a saying in Luoyang which went; "He [Yan], Deng [Yang] and Ding [Mi] create turmoil in the imperial capital".<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "五月，帝稱疾不與政事。時人為之謠曰：「何、鄧、丁，亂京城。」"{{relevance inline|date=August 2023}}</ref> --> In June or July 247, Sima Yi said he was ill and withdrew from politics.{{sfnp|Sima|1084|loc=vol. 75}}{{efn|At the time, Sima Yi was already around 68 years old, and it is probable he was suffering from a variety of health-related issues. Sima Yi's wife Zhang Chunhua had recently died so it is probable he was distraught at the death of his wife and went into mourning.}}

The Princes of Qinghe and Pingyuan had been arguing among themselves with [[Sun Li (general)|Sun Li]], the governor of [[Ji Province]], over a land dispute for the past eight years, after consulting with Sima Yi, arguing a map from the palace archives made during the time of the latter prince's enfeoffment should be used. This map would favour Pingyuan's claim but Cao Shuang preferred the plaint of the Prince of Qinghe and dismissed the appeal. Sun Li sent a memorial in a forceful tone and Cao Shuang, in anger, banished him from his position for five years. He was eventually reinstated as the governor of [[Bing Province]], and visited Sima Yi before taking his leave. Sima Yi saw that something was amiss, and he asked him if he thought it a small thing to be made the governor of Bing Province, or if he instead felt regret for having got himself involved in this whole affair. Sun Li, in tears, said that he didn't take official ranks or past affairs to heart, but that he was worried about the dynasty's future. Sima Yi replied: "Stop for the time being, and bear the unbearable."{{sfnp|Sima|1084|loc=vol. 75}}<!-- reference supports entire paragraph. just removed seven duplicates attached to individual sentences -->

In April or May 248, Zhang Dang ({{lang|zh-hant|張當}}), a palace eunuch, illegally transferred eleven women out of the imperial harem and presented them to Cao Shuang to be his concubines. Cao Shuang and his close aides thought Sima Yi was seriously ill and could no longer do anything so they plotted with Zhang Dang to overthrow the emperor Cao Fang and put Cao Shuang on the throne. They were still wary of Sima Yi, however, and did not lower their guard against him.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "九年春三月，黃門張當私出掖庭才人石英等十一人，與曹爽為伎人。爽、晏謂帝疾篤，遂有無君之心，與當密謀，圖危社稷，期有日矣。帝亦潛為之備，爽之徒屬亦頗疑帝。"</ref>

In late 248, Sima Yi, together with his eldest son [[Sima Shi]], and with possibly his second eldest son [[Sima Zhao]], began plotting against Cao Shuang{{sfnp|Sima|1084|loc=vol. 75}}{{efn|Sima Shi was surely involved in the plotting with his father but it is uncertain how involved Sima Zhao was. The more traditional view, such as that espoused by [[Fang Xuanling]], is Sima Zhao was not informed until the evening before the incident. Historians such as [[Sima Guang]] disregard this view and assert Sima Zhao was as deeply involved in the plot as his elder brother.}}

===Meeting with Li Sheng===
[[Li Sheng (Three Kingdoms)|Li Sheng]], one of Cao Shuang's supporters, had been reassigned to be the Inspector of [[Jing Province]]. Cao Shuang secretly instructed him to check if Sima Yi was as ill as he claimed so Li Sheng visited Sima Yi before leaving for Jing Province. Sima Yi knew the true purpose of Li Sheng's visit so he pretended to be frail and senile. Li Sheng saw Sima Yi could not move around and wear clothes without help from his servants, and could not consume [[congee]] without soiling his clothes. He then told Sima Yi: "Everyone thought that your illness was a minor one; alas, who expected you to be in such poor health?" Sima Yi pretended to cough and pant as he replied: "I am old and sick. My death could come any day. When you go to [[Bing Province]], you should be careful because it is near barbarian territory. We might not see each other again, so I entrust my sons Shi and Zhao to your care." Li Sheng corrected him: "I am returning to my home province, not Bing Province". Sima Yi pretended to mishear and continued saying: "You are going to Bing Province, aren't you?" Li Sheng corrected him again: "My home province is Jing Province". Sima Yi replied: "I am so old and weak that I can't even hear you properly. So now you are going back to your home province. It's time for you to make some glorious achievements!" Li Sheng returned to Cao Shuang and told him: "Lord Sima is like a corpse who still breathes. His spirit has already departed his body. He can't even think." Later, he said: "It's sad to see that the Grand Tutor will not be able to return to service". Thus duped, Cao Shuang and his associates lowered their guard against Sima Yi.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "會河南尹李勝將莅荊州，來候帝。帝詐疾篤，使兩婢侍，持衣衣落，指口言渴，婢進粥，帝不持杯飲，粥皆流出霑胷。勝曰：「衆情謂明公舊風發動，何意尊體乃爾！」帝使聲氣纔屬，說「年老枕疾，死在旦夕。君當屈幷州，幷州近胡，善為之備。恐不復相見，以子師、昭兄弟為託」。勝曰：「當還忝本州，非幷州。」帝乃錯亂其辭曰：「君方到幷州。」勝復曰：「當忝荊州。」帝曰：「年老意荒，不解君言。今還為本州，盛德壯烈，好建功勳！」勝退告爽曰：「司馬公尸居餘氣，形神已離，不足慮矣。」他日，又言曰：「太傅不可復濟，令人愴然。」故爽等不復設備。"{{pb}}{{harvnb|Watanabe|2006|p=281}}; {{harvnb|Sima|1084|loc=vol. 75}}.</ref>

===Seizing power===
{{main|Incident at the Gaoping Tombs}}

According to the ''Book of Jin'', on the night of 4 February, the day before the planned ''coup'', Sima Yi sent spies to monitor the behaviour of his two eldest children. In the early hours of the next morning, the spies reported to Sima Yi that Sima Shi went to bed as usual and slept peacefully whereas Sima Zhao, having supposedly only been informed of the plan during the prior evening, tossed and turned in his bed.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 2}}: "將發夕乃告之，既而使人覘之，帝寢如常，而文帝不能安席。"</ref>

On 5 February 249, Cao Shuang and his brothers accompanied the emperor Cao Fang on a visit to Gaoping Mausoleum ({{lang|zh|高平陵}}) to pay their respects to the late emperor Cao Rui.{{sfnp|Sima|1084|loc=vol. 75}}{{efn|The mausoleum was that of the late Cao Rui (Emperor Ming). The ''Wei Shi Ji'' (魏世籍) of [[Sun Sheng (Jin dynasty)|Sun Sheng]] (孙盛) reads: "Gaoping ''ling'' is on Dashishan, south of the Luoshui and ninety ''li'' from the city of Luoyang."}} On that day, Sima Yi seized the opportunity to stage a ''coup d'état'' against his co-regent. He went to Yongning Palace to meet [[Empress Guo (Cao Rui's wife)|Empress Dowager Guo]] to request the memorialisation of a decree ordering the removal of Cao Shuang and his brothers from power.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "嘉平元年春正月甲午，天子謁高平陵，爽兄弟皆從。是日，太白襲月。帝於是奏永寧太后廢爽兄弟。"</ref> Thereafter, the city gates were closed while Sima Shi's previously arranged 3,000 forces that had gathered at the Sima Gate ({{lang|zh-hant|司馬門}}<!-- no relation -->) under his command were led to occupy the palace gates. Sima Yi later commented: "This son really worked well." Soon, the troops were lined up along the palace grounds, passing through Cao Shuang's camp. Cao Shuang's Controller of Camp Yan Shi ({{lang|zh|嚴世}}) was on the upper floor, drawing his crossbow with the intent to shoot the passing Sima Yi. His colleague Sun Qian ({{lang|zh-hant|孫謙}}) stopped him and said: "We don't know what's going on." Yan Shi thrice prepared to shoot the bow but did not shoot.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "嘉平元年春正月甲午，天子謁高平陵，爽兄弟皆從。是日，太白襲月。帝於是奏永寧太后廢爽兄弟。時景帝為中護軍，將兵屯司馬門。帝列陣闕下，經爽門。 爽帳下督嚴世上樓，引弩將射帝，孫謙止之曰：「事未可知。」三注三止，皆引其肘不得發。"</ref>

Meanwhile, Sima Yi granted imperial authority to [[Gao Rou]] the [[Situ (office)|Minister over the Masses]] and appointed him as acting General-in-Chief ({{lang|zh-hant|大將軍}}), and ordered him to take command of Cao Shuang's troops, stating: "You're now like [[Zhou Bo]]." Sima Yi also appointed [[Wang Guan (Three Kingdoms)|Wang Guan]] the Minister Coachman ({{lang|zh|太僕}}), whom Sima Yi had previously recommended during Cao Rui's reign<ref>"Grand Commandant Sīmǎ Xuán-wáng requested Guàn be an Advisor Palace Official".<br>Chen Shou, ''Sanguozhi'', vol.24 (biography of Wang Guan).{{full citation needed|date=August 2023}}</ref> as acting Commandant of the Central Army ({{lang|zh-hant|中領軍}}), and ordered him to seize command of the troops under Cao Shuang's brother Cao Xi ({{lang|zh|曹羲}}).<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "於是假司徒高柔節，行大將軍事，領爽營， ...命太僕王觀行中領軍，攝羲營。"{{harvnb|Sima|1084|loc=vol. 75}}.</ref>

Sima Yi, along with the [[Grand Commandant]] [[Jiang Ji]] and others, led troops out of Luoyang to the [[pontoon bridge]] above the [[Luo River (Henan)|Luo River]], where he sent a [[Memorial to the throne|memorial]] to the emperor Cao Fang listing Cao Shuang's crimes—which included not fulfilling his duty as regent and corrupting the government, and conspiring against the throne—and asking the emperor to remove Cao Shuang and his brothers from their positions of power.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "帝親帥太尉蔣濟等勒兵出迎天子，屯于洛水浮橋，上奏曰：「先帝詔陛下、 ...伺察非常。」"{{pb}}{{harvnb|Sima|1084|loc=vol. 75}}.</ref> Cao Shuang blocked the memorial from reaching Cao Fang and left the emperor at the south of the [[Yi River (Henan)|Yi River]] while ordering his men to cut down trees to build [[Cheval de frise|anti-cavalry blockades]] and station about 1,000 troops nearby to guard against Sima Yi's advances. Sima Yi sent Xu Yun ({{lang|zh|許允}}) and [[Chen Tai]] to persuade Cao Shuang to plead guilty as early as possible. Sima Yi also sent Yin Damu ({{lang|zh|尹大目}}), a man whom Cao Shuang trusted, to tell him nothing more would result from this aside from his dismissal. [[Huan Fan]], the Minister of Finance ({{lang|zh|大司農}}), had left the city to visit Cao Shuang's camp, with Sima Yi commenting: "The 'bag of wisdom' is gone." Jiang Ji responded: "Huan Fan is indeed wise, but stupid horses are too much attached to the beans in their manger. Cao Shuang is certain not to employ his counsel."<ref>{{harvnb|Sima|1084|loc=vol. 75}}.{{pb}}{{harvnb|''Book of Jin''|648|loc=vol. 1}} reverses the speakers in this exchange: "大司農桓範出赴爽，蔣濟言於帝曰：「智囊往矣。」帝曰：「爽與範內踈而智不及，駑馬戀短豆，必不能用也。」"</ref> Huan Fan attempted to persuade Cao Shuang and his brothers to flee to [[Xuchang]] with the emperor, and to issue an edict denouncing Sima Yi as a traitor and drafting troops to fight back but they remained undecided. Cao Shuang ultimately surrendered to Sima Yi and gave up his powers, thinking he could still lead a luxurious life in retirement.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "夜遣侍中許允、尚書陳泰詣帝，觀望風旨。帝數其過失，事止免官。泰還以報爽，勸之通奏。帝又遣爽所信殿中校尉尹大目諭爽，指洛水為誓，爽意信之。 ...終不能從，乃曰：「司馬公正當欲奪吾權耳。吾得以侯還第，不失為富家翁。」"{{pb}}{{harvnb|Sima|1084|loc=vol. 75}}.</ref> Huan Fan scolded them, saying: "[[Cao Zhen]] was a good man, yet sired you and your brothers, little pigs and calves that you are! I never expected to be involved with you and have my family annihilated."{{sfnp|Sima|1084|loc=vol. 75}}

After returning to Luoyang, Cao Shuang and his brothers were carefully guarded, and on 9 February 249,{{efn|name=death date|Cao Fang's biography in the ''[[Sanguozhi]]'' recorded Cao Shuang and his associates Ding Mi ({{lang|zh|丁謐}}), Deng Yang, He Yan, Bi Gui, Li Sheng, and Huan Fan were executed along with their extended families on the ''wuxu'' day of the 1st month of the 1st year of the Jiaping era of Cao Fang's reign.<ref>{{harvnb|Chen and Pei|429|loc={{strong|4}} }}: "[嘉平元年春正月]戊戌，有司奏収黃門張當付廷尉，考實其辭，爽與謀不軌。又尚書丁謐、鄧颺、何晏、司隷校尉畢軌、荊州刺史李勝、大司農桓範皆與爽通姦謀，夷三族。"</ref> This date corresponds to 9 February 249 in the Julian calendar.}} Cao Shuang was accused of plotting treason after the palace eunuch Zhang Dang ({{lang|zh-hant|張當}}), who had been sent to the ''tingyu'', had testified Cao Shuang and his associates were planning to seize the throne for themselves. Cao Shuang was arrested along with his brothers and his supporters, including He Yan, Ding Mi, [[Deng Yang]], [[Bi Gui]], [[Li Sheng (Three Kingdoms)|Li Sheng]], and [[Huan Fan]]. They were subsequently executed with the rest of their families and relatives on the same day.<ref>{{harvnb|Sakaguchi|2005|p=162}}; {{harvnb|Watanabe|2006|p=282}}; {{harvnb|Sima|1084|loc=vol. 75}}.</ref> Jiang Ji had attempted to persuade Sima Yi to spare Cao Shuang and his brothers in consideration of the meritorious service rendered by their father, Cao Zhen but Sima Yi refused.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "既而有司劾黃門張當，并發爽與何晏等反事，乃收爽兄弟及其黨與何晏、丁謐、鄧颺、畢軌、李勝、桓範等誅之。蔣濟曰：「曹真之勳，不可以不祀。」帝不聽。"</ref> Two of Cao Shuang's subordinates Lu Zhi ({{lang|zh|魯芝}}) and Yang Zong ({{lang|zh-hant|楊綜}}) had been implicated in the plot and were arrested as well, although Sima Yi pardoned them under the rationale: "Each of them was serving his own master."{{sfnp|Sima|1084|loc=vol. 75}}

Earlier, when Huan Fan escaped from Luoyang to join Cao Shuang, he encountered Si Fan ({{lang|zh|司蕃}}), who was guarding the Changping Gate. Because Si Fan used to serve under Huan Fan, Si Fan trusted Huan Fan and allowed him to pass through. Once he was out of Luoyang, Huan Fan turned back and told Si Fan: "The Imperial Tutor [Sima Yi] is planning to commit treason. You should come with me!" Si Fan, however, stayed behind and hid himself. After the ''coup d'état'', Si Fan surrendered himself to Sima Yi and told him what happened earlier. Sima Yi asked: "What's the punishment for falsely accusing someone of treason?" The reply was: "According to the law, the one who makes the false accusation shall be punished for treason." Huan Fan was then executed along with the rest of his family.<ref>{{harvnb|Yu, ''Weilüe''}}: "範不從，乃突出至平昌城門，城門已閉。門候司蕃，故範舉吏也，範呼之，舉手中版以示之，矯曰：「有詔召我，卿促開門！」蕃欲求見詔書，範呵之，言「卿非我故吏邪，何以敢爾？」乃開之。範出城，顧謂蕃曰：「太傅圖逆，卿從我去！」蕃徒行不能及，遂避側。 ...會司蕃詣鴻臚自首，具說範前臨出所道。宣王乃忿然曰：「誣人以反，於法何應？」主者曰：「科律，反受其罪。」乃收範於闕下。時人持範甚急，範謂部官曰：「徐之，我亦義士耳。」遂送廷尉。" Cited in {{harvnb |Chen and Pei|429|loc={{strong|9}} }}.</ref>

Cao Shuang's younger cousin Cao Wenshu had perished and the family of his widowed wife, [[Xiahou Lingnü]] wanted to remarry her to someone else, in response to which she cut off her ears and later her nose.{{sfnp|Sima|1084|loc=vol. 75}} Her family asserted the Cao clan was exterminated but she retorted by saying: "I have heard that a person of worth does not renounce his principles because of changes in fortune, nor a righteous person change his mind with a view to preservation or destruction. While the Cao flourished, I was bent on keeping my chastity. Now that they have declined and perished, can I bear to renounce them? Even animals do not act this way; how can I?" When Sima Yi heard of this, he allowed her to adopt a son as an heir to the Cao clan.{{sfnp|Sima|1084|loc=vol. 75}} The contemporaneous Shu official and regent [[Fei Yi]] gave his own comment regarding the coup:
{{Blockquote|... If Sima Yi really considered Cao Shuang to be guilty of extravagance and arrogance, it would suffice for him to execute him according to the law. However, he exterminated even his infant children, branding them with the name of disloyalty, effectively wiping out Zidan's line. Also, He Yan's son was a nephew of the Wei ruler, and even he was killed. Sima Yi was assuming too much power and behaving improperly.&nbsp;—[[Fei Yi]] on Sima Yi's coup d'état.<ref>"懿感曹仲付己不一，豈爽與相干？事勢不專，以此陰成疵瑕。初無忠告侃爾之訓，一朝屠戮，讒其不意，豈大人經國篤本之事乎！若爽信有謀主之心，大逆已搆，而發兵之日，更以芳委爽兄弟。懿父子從後閉門舉兵，蹙而向芳，必無悉寧，忠臣為君深慮之謂乎？以此推之，爽無大惡明矣。若懿以爽奢僭，廢之刑之可也，滅其尺口，被以不義，絕子丹血食，及何晏子魏之親甥，亦與同戮，為僭濫不當矣。"<br>Appendix to Fei Yi's ''Sanguozhi''.</ref>}}

On 18 February or sometime in March 249, Cao Fang appointed Sima Yi as Imperial Chancellor, and added another four counties to Sima Yi's marquisate, bringing the size of the marquisate to eight counties and 20,000 taxable households. Cao Fang also awarded Sima Yi the privilege of not having to announce his name when he spoke to the emperor. Sima Yi declined the appointment of Imperial Chancellor.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "二月，天子以帝為丞相，增封潁川之繁昌、鄢陵、新汲、父城，并前八縣，邑二萬戶，奏事不名。固讓丞相。"{{pb}}{{harvnb|Watanabe|2006|p=283}}; {{harvnb|Sima|1084|loc=vol. 75}}.{{pb}}{{harvnb|Fang|1952}}: "Jin Shu, Chronicle of Xuandi differs in matters of dates and gives more details: 'Second Month (March 1–30, 249). The Son of Heaven appointed Xuandi ''chengxiang'', increased his fief with Fanchang, Yanling, Xinji and Fucheng, all in Yingchuan, which including his former fiefs made in all eight ''xian'' consisting of twenty-thousand households, and commanded that his ''ming'' should not be mentioned in memorials to the throne. He earnestly declined the appointment to ''chengxiang''.'"</ref> In January or February 250, Cao Fang awarded Sima Yi the [[nine bestowments]] and an additional privilege of not having to kowtow during imperial court sessions. Sima Yi declined the nine bestowments.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "冬十二月，加九錫之禮，朝會不拜。固讓九錫。"{{pb}}{{harvnb|Sima|1084|loc=vol. 75}}.</ref> In February or March 250, Cao Fang had an [[ancestral shrine]] for the Sima family built in Luoyang, increased the size of Sima Yi's personal staff, promoted some of Sima Yi's personal staff, and enfeoffed Sima Yi's sons [[Sima Rong]] ({{lang|zh-hant|司馬肜}}) and [[Sima Lun]] as village marquises. Because Sima Yi was chronically ill, he could not regularly attend imperial court sessions so Cao Fang often visited him at his residence to consult him on policy matters.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "二年春正月，天子命帝立廟于洛陽，置左右長史，增掾屬、舍人滿十人，歲舉掾屬任御史、秀才各一人，增官騎百人，鼓吹十四人，封子肜平樂亭侯，倫安樂亭侯。帝以久疾不任朝請，每有大事，天子親幸第以諮訪焉。"</ref>

===Suppressing Wang Ling's rebellion===
{{main|Wang Ling's Rebellion}}

[[Wang Ling (Three Kingdoms)|Wang Ling]] the Grand Commandant and his nephew Linghu Yu ([[:zh:令狐愚|令狐愚]]) the Inspector of [[Yan Province]] became worried about Sima Yi's growing influence over the emperor Cao Fang, so they plotted to replace him with [[Cao Biao]], the Prince of Chu, while instating his capital city as Xuchang, and then to overthrow Sima Yi.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "兗州刺史令狐愚、太尉王淩貳於帝，謀立楚王彪。"</ref> Linghu Yu, however, died in December 249 or January 250.{{sfnp|Sima|1084|loc=vol. 75}}

In February 251, Wang Ling either lied by stating Wu forces were approaching the Tu River ({{lang|zh|塗水}}) and requested the Wei government give him troops to resist the invaders or was telling the truth that they were obstructing the river, but wanted to use the troops for his own malicious purposes. Sima Yi was suspicious of Wang Ling's intention so he refused to approve the request.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "三年春正月，王淩詐言吳人塞涂水，請發兵以討之。帝潛知其計，不聽。"</ref> On 7 June 251, upon receiving intelligence of Wang Ling's plot from officials Yang Hong ({{lang|zh-hant|楊弘}}) and Huang Hua ({{lang|zh-hant|黃華}}), Sima Yi immediately mobilised troops to attack Wang Ling and travelled down the river while bestowing additional authority upon [[Zhuge Dan]] and ordering him to lead his own forces to encroach upon Wang Ling's position.<ref>"Grand Tutor Sīmǎ [Yì] Xuān-wáng secretly led the army on an eastern expedition, appointing Dàn as General Defending the East, with Acting Staff of Authority as Commander of Yángzhōu's various military affairs, and fief as Marquis of Shānyáng precinct."<br>Chen Shou, ''Sanguozhi'', vol.28 (biography of Zhuge Dan).{{full citation needed|date=August 2023}}</ref> Sima Yi issued a pardon to Wang Ling and sent a secretary to call for his surrender. Sima Yi's army reached Gancheng ({{lang|zh|甘城}}) within a few days and advanced to within 100 ''[[Chi (unit)|chi]]'' of Wang Ling's base to put pressure on him. Wang Ling knew Sima Yi was aware of his plans to rebel and that his own forces were too weak so he gave up, sent his subordinate Wang Yu ({{lang|zh|王彧}}) to apologise on his behalf, and handed over his official seal and ceremonial axe to Sima Yi. When Sima Yi's army reached Qiutou ({{lang|zh|丘頭}}), Wang Ling tied himself up but Sima Yi, acting on imperial order, sent a Registrar ({{lang|zh|主簿}}) to unbind Wang Ling, reassure him of his safety, and return to him his official seal and ceremonial axe.{{sfnp|Sima|1084|loc=vol. 75}}

Wang Ling met with Sima Yi at Wuqiu ({{lang|zh|武丘}}) with a distance of more than ten [[Chi (unit)|zhang]] between both of them. Wang Ling told Sima Yi: "If I am guilty, you can summon me to meet you. Why do you need to come here?" Sima Yi replied: "That's because you don't respond to summons." Wang Ling said: "You have failed me!" Sima Yi responded: "I would rather fail you than fail the state."{{sfnp|Sima|1084|loc=vol. 75}} Wang Ling was then escorted as a prisoner back to Luoyang. To discern Sima Yi's true intentions, Wang Ling asked him if he could receive nails for his coffin. Sima Yi had them given to him. While ''en route'' to Luoyang, when Wang Ling passed by a shrine honouring the Wei general [[Jia Kui (general)|Jia Kui]], he said; "Jia Liangdao! Only the gods know Wang Ling is truly loyal to Wei." Wang Ling committed suicide on 15 June 251 by consuming poison at Xiang County ({{lang|zh|項縣}}; around present-day [[Shenqiu County]], Henan).<ref>{{harvnb|Chen and Pei|429|loc={{strong|4}} }}: "嘉平三年]四月甲申， &nbsp;... 丙午，聞太尉王淩謀廢帝，立楚王彪，太傅司馬宣王東征淩。五月甲寅，淩自殺。"</ref> Sima Yi had Wang Ling's conspirators arrested and executed along with their families.{{sfnp|Sima|1084|loc=vol. 75}}

Cao Fang sent Wei Dan ({{lang|zh|韋誕}}) as an emissary to meet Sima Yi at Wuchi ({{lang|zh|五池}}) and congratulate him on his success in suppressing Wang Ling's rebellion. When Sima Yi reached Gancheng, Cao Fang sent Yu Ni ({{lang|zh|庾嶷}}) as an emissary to appoint Sima Yi as Chancellor of State, and promote him from a marquis to a duke with the title "Duke of [[Anping Commandery]]". One of Sima Yi's grandsons and one of his brothers were also enfeoffed as marquises. At the time, the Sima family had 19 marquises and 50,000 taxable households in all their combined marquisates. Sima Yi declined the appointment of Chancellor of State and refused to accept his enfeoffment as a duke.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "天子遣侍中韋誕持節勞軍于五池。帝至自甘城，天子又使兼大鴻臚、太僕庾嶷持節，策命帝為相國，封安平郡公，孫及兄子各一人為列侯，前後食邑五萬戶，侯者十九人。固讓相國、郡公不受。"</ref>

[[Guo Huai]]'s wife, the younger sister of Wang Ling, was taken into custody by [[Censorate|imperial censors]]. Guo Huai apprehensively relented and let her be taken, not wanting to push things further, but when his five sons kowtowed before him until their foreheads started bleeding, he relented and ordered his subordinates to bring back his wife from the imperial censors. Guo Huai wrote a letter to Sima Yi: "My five sons are willing to sacrifice their lives for their mother. If they lose their mother, I lose them too. Without my five sons, I will no longer exist. If I have violated the law by seizing back my wife from the imperial censors, I am willing to see the Emperor and take full responsibility for my actions." After reading Guo Huai's letter, Sima Yi made an exception for Guo Huai's wife and pardoned her.<ref>Guo Song, ''Wei Jin Shiyu'':{{unreliable source?|date=August 2023}} "淮妻，王淩之妹。淩誅，妹當從坐，御史往收。督將及羌、胡渠帥數千人叩頭請淮表留妻，淮不從。妻上道，莫不流涕，人人扼腕，欲劫留之。淮五子叩頭流血請淮，淮不忍視，乃命左右追妻。於是追者數千騎，數日而還。淮以書白司馬宣王曰：「五子哀母，不惜其身；若無其母，是無五子；無五子，亦無淮也。今輒追還，若於法未通，當受罪於主者，覲展在近。」書至，宣王亦宥之。" Cited in {{harvnb|Chen and Pei|429|loc={{strong|26}} }}, biography of Guo Huai.</ref>

The ''Weilüe'' recounts a story of a man named Yang Kang ({{lang|zh-hant|楊康}}), a former personal aide of Linghu Yu who divulged the conspiracy of Linghu Yu, who wanted to engage in a rebellion in 249 or 250. Sima Yi, while stationed in [[Shouchun]], asked Shan Gu ({{lang|zh|單固}}), another former aide: "Did Linghu Yu plot a rebellion?" Shan Gu denied this but Sima Yi doubted him because Yang Kang had previously said Shan Gu had also been involved in the plot. Shan Gu and his family were arrested, and he was tortured and interrogated. Shan Gu remained firm in his denial so Sima Yi had Yang Kang called in to compare their testimonies. Yang Kang was unable to defend his own rhetoric so Shan Gu began cursing at Yang Kang. Yang Kang had thought he would be enfeoffed as a reward but because his own testimony had been inconsistent, he was sentenced to death together with Shan Gu, and both men were dragged out and executed.{{sfnp|Sima|1084|loc=vol. 75}}

Around that time, the corpses of Wang Ling and Linghu Yu had been dragged out of their tombs and their bodies had been exposed for three days in the nearest market place.{{sfnp|Sima|1084|loc=vol. 75}}

In July 251, Cao Biao was forced to [[suicide in China|commit suicide]]. Sima Yi then relocated the other nobles from the Cao family to [[Ye (ancient China)|Ye]], where they were effectively put under house arrest.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "夏四月，帝自帥中軍，汎舟沿流，九日而到甘城。淩計無所出，乃迎于武丘，面縛水次，曰：「淩若有罪，公當折簡召淩，何苦自來邪！」帝曰：「以君非折簡之客故耳。」即以淩歸于京師。道經賈逵廟，淩呼曰：「賈梁道！王淩是大魏之忠臣，惟爾有神知之。」至項，仰鴆而死。收其餘黨，皆夷三族，并殺彪。悉錄魏諸王公置于鄴，命有司監察，不得交關。"{{pb}}{{harvnb|Sima|1084|loc=vol. 75}}.</ref>

==Death and posthumous honours==
In July 251, when Sima Yi became critically ill, he dreamt of [[Jia Kui (general)|Jia Kui]] and [[Wang Ling (Three Kingdoms)|Wang Ling]] being honoured, which disturbed him.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "六月，帝寢疾，夢賈逵、王淩為祟，甚惡之。"<br />"In the 6th Month, the Emperor was bedridden by illness. He dreamt of Jia Kui and Wang Ling as ghosts that greatly hated him."</ref> Sima Yi died on 7 September 251 in Luoyang at the age of 73. Emperor Cao Fang donned mourning garments, attended Sima Yi's funeral in person, and ordered Sima Yi to be buried with the same honours as those accorded to [[Huo Guang]] in the [[Western Han dynasty]]. He also posthumously appointed Sima Yi as Chancellor of State and elevated him to the status of a duke. Sima Yi's younger brother [[Sima Fu]], however, declined the ducal title and a ''wenliangche'' ({{lang|zh|轀輬車}}){{efn|A ''wenliangche'' (轀輬車) was a large horse-drawn carriage with enough space inside for a person to lie down. It was also used for carrying the coffin of a deceased person. See the [http://cidian.wenku1.com/%E8%BD%80%E8%BC%AC%E8%BB%8A/ dictionary definition].}} on behalf of his deceased brother, stating Sima Yi would have done that if he was still alive.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "秋八月戊寅，崩于京師，時年七十三。天子素服臨弔，喪葬威儀依漢霍光故事，追贈相國、郡公。弟孚表陳先志，辭郡公及轀輬車。"</ref>

Sima Yi was buried on 19 October 251 at Heyin County ({{lang|zh|河陰縣}}; north of present-day [[Mengjin County]], Henan). Cao Fang granted him the posthumous title "Wenzhen" ({{lang|zh|文貞}}), which was later changed to "Wenxuan" ({{lang|zh|文宣}}). Before his death, however, Sima Yi had made arrangements to be buried at Mount Shouyang ({{lang|zh|首陽山}}; in [[Yanshi]], Luoyang, Henan) with no markers such as tombstone or trees around his tomb, to be dressed in plain clothes, and have no luxury items buried with him. He also stated his family members who died after him should not be buried with him.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "九月庚申，葬于河陰，謚曰文貞，後改謚文宣。先是，預作終制，於首陽山為土藏，不墳不樹；作顧命三篇，斂以時服，不設明器，後終者不得合葬。一如遺命。"</ref>

After Sima Yi's death, his eldest son Sima Shi assumed his father's authority<ref>{{harvnb|Fang|1952}}: "The Emperor appointed his son, the ''wei jiangjun'' Sima Shi to be ''fujun da jiangjun'' and ''lu shang-shu shi''."</ref> up until his own death on 23 March 255,<ref>{{harvnb|Fang|1952}}: "The ''wei jiangjun'' Sima Zhao went from Luoyang to inquire after Sima Shi's health. Sima Shi ordered him to take command of all the forces. On the day ''[[sexagenary cycle|xinhai]]'' (March 23), Sima Shi died at Xuchang."</ref> after which Sima Yi's second eldest son Sima Zhao took up his elder brother's position.<ref>{{harvnb|Fang|1952}}: "Second month. On the day ''[[sexagenary cycle|tingsi]]'' (March 29), the Emperor appointed Sima Zhao to be ''da jiangjun'' and ''lu shangshu shi''."</ref> On 2 May 264, when the Wei emperor [[Cao Huan]] enfeoffed Sima Zhao as the vassal "King of Jin",<ref>{{harvnb|Fang|1952}}: "On the day ''[[sexagenary cycle|jimao]]'' (May 2), the rank of the Duke of Jin was advanced to that of Prince of Jin, with an additional ten prefectures as his fief."</ref> Sima Zhao honoured his father with the posthumous title "King Xuan of Jin".<ref>{{harvnb|Fang|1952}}: "On [July 5], the Lord of Wenxuan of Wuyang, Sima Yi, was posthumously enfeoffed as Prince Xuan of Jin, and the Lord of Zhongwu (of Wuyang), Sima Shi as Prince Jing of Jin."</ref>

Sima Zhao died on 6 September 265,<ref>{{harvnb|Fang|1952}}: "''[[Records of the Three Kingdoms|SGZ]]'' has: "In autumn, in the eighth month, on the day ''[[sexagenary cycle|xinmao]]'', the ''xiangguo'', Prince of Jin, died." ''[[Book of Jin|Jin Shu]]'', Chronicle of Wendi states: "In autumn, in the eighth month, on the day ''xinmao'', Wendi died in his main hall at the age of fifty-five." Sima Zhao lived 211–265 AD."</ref> and his eldest son [[Emperor Wu of Jin|Sima Yan]] succeeded him in his position.<ref>{{harvnb|Fang|1952}}: "''SGZ'' has: "On the day ''[[sexagenary cycle|renchen]]'' (September 7), the Crown Prince of Jin, Sima Yan, succeeded to his enfeoffment and inherited his rank; he assumed the Presidency of the myriad officials and had gifts and documents of appointments conferred upon him, all in conformity with ancient institutions."</ref> In February 266, after Sima Yi's grandson [[Emperor Wu of Jin|Sima Yan]] usurped the throne from Cao Huan and established the [[Jin dynasty (265-420)|Jin dynasty]] with himself as the emperor, he honoured his grandfather with the posthumous title "Emperor Xuan of Jin" with the [[temple name]] "Gaozu", and named his grandfather's burial place "Gaoyuan Mausoleum" ({{lang|zh|高原陵}}).<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "晉國初建，追尊曰宣王。武帝受禪，上尊號曰宣皇帝，陵曰高原，廟稱高祖。"</ref>

==Anecdotes==
In his youth, Sima Yi was a close friend of [[Hu Zhao]] ({{lang|zh|胡昭}}). In one incident, Zhou Sheng ({{lang|zh|周生}}) kidnapped Sima Yi and wanted to kill him. Hu Zhao braved danger to meet Zhou Sheng in the [[Xiao Mountains]] and tried to persuade him to release Sima Yi. When Zhou Sheng refused, Hu Zhao cried and pleaded with him. Zhou Sheng was so moved by Hu Zhao's sincerity he released Sima Yi. Hu Zhao told nobody about this incident and very few people knew Sima Yi owed him his life.<ref>[[Huangfu Mi]], ''Gaoshi zhuan'': "初，晉宣帝為布衣時，與昭有舊。同郡周生等謀害帝，昭聞而步陟險，邀生於崤、澠之間，止生，生不肯。昭泣與結誠，生感其義，乃止。昭因與斫棗樹共盟而別。昭雖有陰德於帝，口終不言，人莫知之。" Cited in {{harvnb|Chen and Pei|429|loc={{strong|11}} }}.</ref>

A different and likely fictional version of Sima Yi's joining of Cao Cao's administration comes from a ''Weilüe'' account that states [[Cao Hong]], a veteran general serving under Cao Cao, had heard of Sima Yi's talent and wanted to recruit him as an adviser. Sima Yi thought little of Cao Hong, and refused to meet him, pretending to be so ill he could not walk without using crutches. Cao Hong was so unhappy he reported it to Cao Cao, who then summoned Sima Yi. When Sima Yi heard Cao Cao wanted to meet him, he immediately threw aside his crutches and rushed there.<ref>{{harvnb|Yu, ''Weilüe''}}: "晉宣帝好學，曹洪自以麄踈，屈身輔帝。帝恥往訪，乃託病拄杖。洪恨之，以語太祖。太祖召帝，乃投杖以應命。" Cited in {{harvnb|Yu, ''Beitang Shuchao''|loc= vol. 133.}}.</ref>

Cao Cao heard Sima Yi was ambitious and had a ''lang gu'' ({{lang|zh|狼顧}}){{efn|The term ''lang gu'' (狼顧) refers to a wolf turning its head to look behind. It is an archaic term used to describe people who constantly feel suspicious and insecure. See the [http://www.zdic.net/c/c/2a/66193.htm dictionary definition of 狼顧].}} appearance so he wanted to see if it was true. One day, Cao Cao ordered Sima Yi to walk in front of him and made him look back. Sima Yi turned his head to look back without moving his body.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "魏武察帝有雄豪志，聞有狼顧相，欲驗之。乃召使前行，令反顧，面正向後而身不動。"</ref> Cao Cao also once dreamt of three horses feeding from the same trough{{efn|In the 14th-century historical novel ''Romance of the Three Kingdoms'', this dream foreshadows the Sima family's Jin dynasty replacing the Cao Wei state in 266. The Chinese term for "trough", ''cao'' (槽), is a homonym of the family name ''Cao'' (曹), while the three horses represented Sima Yi and his sons Sima Shi and Sima Zhao, so the dream could be interpreted as the three Simas seizing power from the Cao family. Another interpretation is the three horses represented [[Ma Teng]], [[Ma Chao]], and [[Ma Dai]], since the family name ''Ma'' (馬) literally means "horse". Because the Ma family no longer posed a threat to Cao Cao, it was more likely the three horses represented the Simas.<ref>{{harvnb|Luo, ''Sanguo Yanyi''|loc={{strong|78}} }}: "操病勢轉加。忽一夜夢三馬同槽而食，及曉，問賈詡曰：「孤向日曾夢三馬同槽，疑是馬騰父子為禍；今騰已死，昨宵復夢三馬同槽，主何吉凶？」詡曰：「祿馬吉兆也。祿馬歸於曹，王上何必疑乎？」操因此不疑。後人有詩曰：三馬同槽事可疑，不知已植晉根基。曹瞞空有奸雄略，豈識朝中司馬師？</ref>}} and he felt disturbed so he warned [[Cao Pi]]: "Sima Yi won't be content with being a subject; he will interfere in your family matters". Because Cao Pi was on good terms with Sima Yi, he often protected and shielded Sima Yi from criticism. Sima Yi also took great care to create an image of himself as a diligent and faithful subject in front of Cao Cao to reduce the latter's suspicions of him.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "又嘗夢三馬同食一槽，甚惡焉。因謂太子丕曰：「司馬懿非人臣也，必預汝家事。」太子素與帝善，每相全佑，故免。帝於是勤於吏職，夜以忘寢，至於芻牧之間，悉皆臨履，由是魏武意遂安。"</ref>

==Appraisal and legacy==
In 238, when [[Gongsun Yuan]] heard Sima Yi was leading a Wei army to Liaodong to attack him, he sent a messenger to request reinforcements from Wu. Sun Quan eventually complied and wrote to Gongsun Yuan: "Sima Yi is well-versed in military arts. He uses military strategy like a god. He defeats all who stand in his way. I am deeply worried for you, my brother."<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "初，文懿聞魏師之出也，請救於孫權。權亦出兵遙為之聲援，遺文懿書曰：「司馬公善用兵，變化若神，所向無前，深為弟憂之。」"{{pb}}{{harvnb|Sima|1084|loc=vol. 74}}.</ref>

In 249, Wang Guang, the son of [[Wang Ling (Three Kingdoms)|Wang Ling]], said: "Now Sima Yi cannot be fathomed, but what he does never runs contrary to the situation. He gives his assignments to the worthy and capable, and liberally credits those who are better than he; he practices the laws of the former rulers and satisfies the people's desire. Of whatever Cao Shuang did wrong, he has left nothing uncorrected. He does not relax his efforts day and night, his primary aim being to soothe the people."{{sfnp|Sima|1084|loc=vol. 75}}

It was recorded that [[Tan Daoji]], [[Liu Song dynasty]] general, was executed because words spread within the court of [[Emperor Wen]] which said, "Isn't Tan Daoji similar to Sima Zhongda?", seeding paranoia for the emperor due to this parallel.<ref name=Tan>{{Cite web |url=https://zh.wikisource.org/zh-hant/%E5%8D%97%E5%8F%B2/%E5%8D%B715 |script-title=zh:南史/卷15|trans-title="The Southern Dynasties History; Volume 15; Biography of Tan Daoji}}</ref>

[[Emperor Ming of Jin]] ({{reign}}323–325), a descendant of Sima Yi, once asked an official named [[Wang Dao]] to tell him about the origins of the Jin dynasty. Wang Dao told him everything from Sima Yi's career to Cao Mao's [[Sima Zhao's regicide of Cao Mao|attempted coup]] against Sima Zhao. After hearing from Wang Dao, Emperor Ming said: "If what you said is true, how can the Jin (dynasty) expect to last long?"<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "明帝時，王導侍坐。帝問前世所以得天下，導乃陳帝創業之始，及文帝末高貴鄉公事。明帝以面覆牀曰：「若如公言，晉祚復安得長遠！」"</ref>

The [[Tang dynasty]] historian [[Fang Xuanling]], who was the lead editor of Sima Yi's biography in the ''Book of Jin'', noted Sima Yi was known for appearing to be generous and magnanimous while actually being distrustful and jealous. According to Fang, Sima Yi was suspicious, calculative, manipulative, and a skilled practitioner of power politics.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "帝內忌而外寬，猜忌多權變。"</ref> He also noted Sima Yi's cruelty in [[Sima Yi's Liaodong campaign|massacring Liaodong's population]] and exterminating Cao Shuang and his entire clan.<ref>{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "及平公孫文懿，大行殺戮。誅曹爽之際，支黨皆夷及三族，男女無少長，姑姊妹女子之適人者皆殺之，既而竟遷魏鼎云。 ...迹其猜忍，蓋有符於狼顧也。"</ref>

After the fall of the [[Western Jin dynasty]] in 316, the belief began to slowly shift from the popular ideal Wei was the rightful successor to the Han dynasty towards the view Shu may have had greater legitimacy. Before 316, Sima Yi was seen as a righteous figure and was practically deified; after 316, however, he started to be viewed in a more critical manner, which has lasted into the modern age and is exemplified by [[Emperor Taizong of Tang|Li Shimin]]'s comment in the ''Book of Jin'' regarding Sima Yi:

{{Blockquote|When the Son of Heaven was outside, Sima Yi raised armoured troops from the inside. The burial soil was not quite settled, and yet he hurriedly executed and massacred. How can this be a virtuous minister's conduct? An utmost good form was confused by this. In plans for campaign, how can he be wise on the one hand and foolish on the other? How can the heart of a ruler's assistant be formerly loyal and later rebellious? This is why [[Emperor Ming of Jin]] covered his face, ashamed that he through deception and falseness had accomplished achievement. [[Shi Le]] possessed unrestrained words, laughing that treachery returned to settle the enterprise. The ancients had a saying: 'One can accumulate good deeds for three years and they will remain unknown, but a single day's evil will be known by [[Tianxia|All Under Heaven]].' Isn't that just so? Though you may be able to hide it for a time, posterity will still sneer at you in the end. Like stealing bells with your ears covered so no one else can hear their clamour; like planning to steal gold claiming that no one in the market will witness it. Those who see greed up close will spread their knowledge far and wide, and weakness for selfish gain will destroy a reputation. If you cannot restrain yourself for the benefit of others, your self-enrichment will bring disaster to the people.<br />—Li Shimin ([[Emperor Taizong of Tang]]) on Sima Yi<ref>Emperor Tang Taizong, in {{harvnb|''Book of Jin''|648|loc=vol. 1, Appraisal (評)}}: "天子在外，內起甲兵，陵土未乾，遽相誅戮，貞臣之體，寧若此乎！盡善之方，以斯為惑。夫征討之策，豈東智而西愚？輔佐之心，何前忠而後亂？故晉明掩面，恥欺偽以成功；石勒肆言，笑姦回以定業。古人有云，「積善三年，知之者少；為惡一日，聞于天下」，可不謂然乎！雖自隱過當年，而終見嗤後代。亦猶竊鍾掩耳，以眾人為不聞；銳意盜金，謂市中為莫覩。故知貪于近者則遺遠，溺于利者則傷名；若不損己以益人，則當禍人而福己。"</ref>}}

==Family==
Consorts and Issue:<ref>Yu Yu's ''Jin Shu'', cited in vol.01 of ''Shishuo Xinyu'', recorded that Sima Jun was Yi's 17th son. If this record is correct, it would suggest that Yi had many sons whose name were not recorded. One reason could be that these sons died in infancy or childhood.</ref>
* [[Zhang Chunhua|Empress Xuanmu]], of the Zhang clan ({{lang|zh|宣穆皇后 張氏}}; 189–247), personal name Chunhua (春華)
** [[Sima Shi]], Emperor Jing (posthumous) ({{lang|zh|景皇帝 司馬師}}; 208–255), first son<ref>{{harvnb|''Book of Jin''|648|loc=vol. 2}}: "景皇帝諱師，字子元，宣帝長子也。 ...文皇帝諱昭，字子上，景帝之母弟也。"</ref>
** [[Sima Zhao]], Emperor Wen (posthumous) ({{lang|zh|文皇帝 司馬昭}}; 211–265), second son<ref name="Chunhua kidz" />
** Princess Nanyang ({{lang|zh|南陽公主}}), first daughter<ref name="Chunhua kidz">{{harvnb|''Book of Jin''|648|loc=vol. 31}}: "后少有德行，智識過人，生景帝、文帝、平原王幹、南陽公主。"</ref>
*** Married Xun Yi ({{lang|zh|荀霬}}), and had issue (two sons)<ref>{{harvnb|Chen and Pei|429|loc={{strong|10}} }}: "霬妻，司馬景王、文王之妹也，二王皆與親善。"</ref>
** [[Sima Gan]], Prince of [[Pingyuan Commandery|Pingyuan]] ({{lang|zh|平原王 司馬榦}}; 232–311), sixth son<ref name="Chunhua kidz" />
* Lady Fu ({{lang|zh|伏夫人}}; {{floruit}}211 - 270s<ref>Per the ''Book of Jin'', Lady Fu's eldest son Sima Liang was born between 211 and 227. Sima Liang's biography in the same work recorded that she was still alive at the beginning of the ''Xian'ning'' era (275-279). (咸甯初，以扶风池阳四千一百户为太妃伏氏汤沐邑，置家令丞仆，后改食南郡枝江。太妃尝有小疾，祓于洛水，亮兄弟三人侍从，并持节鼓吹，震耀洛滨。武帝登陵云台望见，曰：“伏妃可谓富贵矣。”) ''Jin Shu'', vol.59. She had died by the time of Sima Zhou's death in June 283, as his biography recorded that he wished to be buried with his mother. (临终表求葬母太妃陵次，...) ''Jin Shu'', vol.38.</ref>)
** [[Sima Liang]], Prince Wencheng of [[Runan Commandery|Runan]] ({{lang|zh|汝南文成王 司馬亮}}; d. 291), third son<ref name="Fu Furen bois" >{{harvnb|''Book of Jin''|648|loc=vol. 38}}: "伏夫人生汝南文成王亮、琅邪武王伷、清惠亭侯京、扶風武王駿。"</ref>
** [[Sima Zhou]], Prince Wu of [[Langya Commandery|Langya]] ({{lang|zh|琅邪武王 司馬伷}}; 227–283), fourth son<ref name="Fu Furen bois" />
** Sima Jing, Marquis of Qinghui ({{lang|zh|清惠侯 司馬京}}; {{circa}}230 – {{circa}}253),{{efn|Sima Jing's biography in ''Book of Jin'' only recorded that he died at the age of 24 (by East Asian reckoning). His birth year was between 227 and 232, and his death year was between 250 and 255.}} fifth son<ref name="Fu Furen bois" />
** [[Sima Jun (prince)|Sima Jun]], Prince Wu of [[Fufeng Commandery|Fufeng]] ({{lang|zh|扶風武王 司馬駿}}; 232–286), seventh son<ref name="Fu Furen bois" />
* Lady Zhang ({{lang|zh|張夫人}})
** [[Sima Rong]], Prince Xiao of [[Liang Commandery|Liang]] ({{lang|zh|梁孝王 司馬肜}}; d. 302), eighth son<ref name="Rong Lun" />
* Lady Bai ({{lang|zh|柏夫人}})
** [[Sima Lun]], Prince of [[Zhao Commandery|Zhao]] ({{lang|zh|趙王 司馬倫}}; d. 301), ninth son<ref name="Rong Lun">{{harvnb|''Book of Jin''|648|loc=vol. 1}}: "封子肜平樂亭侯，倫安樂亭侯。"</ref>
*Unknown mother
** Princess Gaolu ({{lang|zh|高陸公主}}), second daughter<ref>{{harvnb|''Book of Jin''|648|loc=vol. 34}}: "文帝嗣立，预尚帝妹高陆公主，...."</ref>
*** Married [[Du Yu]], annotator of the ''[[Zuozhuan]]'', Marquis Cheng of Dangyang ({{lang|zh|當陽成侯 杜預}}; 222–285)<ref>{{harvnb|Yao, ''Book of Chen''|636|loc=vol. 17}}: "案杜預尚晉宣帝第二女高陵宣公主，晉武踐祚，而主已亡，泰始中追贈公主，元凱無復駙馬之號。". Note that here, the princess was referred to as "Princess Xuan of Gaoling".</ref>

==In fiction==
<!-- PLEASE DO NOT INTRODUCE ANY FURTHER DETAILS ON THIS PERSON'S ROLE IN THE GAMES ALREADY MENTIONED IN THIS SECTION. -->
{{see also|Empty Fort Strategy#Zhuge Liang}}
[[File:Sima Yi Peking Opera 京劇 司馬懿 京剧 司马懿.jpg|thumb|Sima Yi of [[Peking opera]]]]
Sima Yi is a major character in the 14th-century historical novel ''[[Romance of the Three Kingdoms]]'',<ref>{{citation
| author= Ma Ka-hong (馬家鴻)
| date= 2018 | type= graduate thesis | place = Tainan | publisher= National Tainan University| script-title=zh:《三國演義》中司馬懿形象之研究
|trans-title= The Portrayal of Sima Yi in ''Romance of the Three Kingdoms''
}}.</ref> which romanticises the historical figures and events before and during the [[Three Kingdoms]] period of China. In the novel, Sima Yi pretends to be a loyal and dedicated subject of the [[Cao Wei|Wei]] state while secretly planning to concentrate power in his hands and prepare for his descendants to usurp the throne one day – "double-dealing"<ref>{{cite journal
| type= book review
| title= Review of ''A Study of Two Classics: A Cultural Critique of The Romance of the Three Kingdoms and The Water Margin'' by Liu Zaifu and Shu Yunzhong
|author= Ge Liangyan
|journal=Chinese Literature: Essays, Articles, Reviews |date= December 2018 |volume= 40 | pages= 259–262
| jstor =26795685
}}</ref>{{rp|261}} in the same way [[Cao Cao]] did towards the [[End of the Han dynasty|end]] of the [[Eastern Han dynasty]]. Sima Yi is also a nemesis to [[Zhuge Liang]] during the [[Zhuge Liang's Northern Expeditions|Shu invasions of Wei]] between 228 and 234, with both of them trying to outwit each other in battles.

Sima Yi is sometimes venerated as a [[door god]] at [[Chinese temple|Chinese]] and [[Taoist temple]]s, usually in partnership with [[Zhuge Liang]].{{citation needed|date=August 2023}}

[[Chan Mou]]'s [[manhua]] comic-book series ''[[The Ravages of Time]]'' is a fictionalised retelling of the history of the late Eastern Han dynasty and the Three Kingdoms, with Sima Yi as the central character.<ref>{{cite web|url=http://www.cdnews.com.tw/cdnews_site/docDetail.jsp?coluid=121&docid=101161662 |script-work=zh:中央日報網路報 |language=zh |work=Cdnews.com.tw |date=14 May 2010 |archive-date=4 March 2012 | url-status=dead | archive-url= https://web.archive.org/web/20120304175909/http://www.cdnews.com.tw/cdnews_site/docDetail.jsp?coluid=121&docid=101161662 | editor = Zhang Dazhi (張達智) | script-title=zh:陳某縱橫三國新史詩《火鳳燎原》第38集上市| trans-title= Chan Mou's new poetic history of Three Kingdoms diplomacy ''The Ravages of Time'' issue 38 released <!-- i think? -->}}</ref>

Sima Yi appears as a playable character in [[Koei]]'s video game series ''[[Dynasty Warriors]]'' and ''[[Warriors Orochi]]''. In the mobile video game ''[[Puzzle & Dragons]]'', he is featured as a God type in the Three Kingdoms 2 Pantheon alongside [[Ma Chao]] and [[Diaochan]]. In the collectible card game ''[[Magic: The Gathering]]'' there is a card named "Sima Yi, Wei Field Marshal" in the ''[[Portal Three Kingdoms]]'' set.<ref>{{cite web
| archive-url= https://web.archive.org/web/20000518031655/http://www.wizards.com/magic/p3k/famous7.html | archive-date= 18 May 2000 | url =http://www.wizards.com/magic/p3k/famous7.html
| title= Sima Yi, Wei Field Marshal
| publisher= Wizards of the Coast
| others= Gao Yan (illus.)
| work= Portal: Three Kingdoms | date= 2000
}}</ref>

Notable actors who have portrayed Sima Yi include: [[Wei Zongwan]], in ''[[Romance of the Three Kingdoms (TV series)|Romance of the Three Kingdoms]]'' (1994);<ref>{{cite web
| url = https://www.sohu.com/a/558223900_120889728
| work = Sohu.com | language= zh 
| script-title=zh:拍《三国演义》时，魏宗万：我54岁还天天骑马，凭什么唐国强可以坐车里
| trans-title= Shooting ''Romance of the Three Kingdoms''. Wei Zongwan: "I'm 54 years old and still have to ride a horse every day. Why does Tang Guoqiang get to ride in a carriage?"
|date= 20 June 2022 
}}</ref> [[Ni Dahong]], in ''[[Three Kingdoms (TV series)|Three Kingdoms]]'' (2010);<ref>{{cite web
| archive-url= https://web.archive.org/web/20160301164759/http://news.163.com/10/0618/08/69EQ4OHT000146BD.html | url = http://news.163.com/10/0618/08/69EQ4OHT000146BD.html
| archive-date= 1 March 2016
| url-status= dead
| via= 163.com | work= China Economic Web
| trans-title= As the curtain closes on ''Three Kingdoms'', Sima Yi has become popular. Ni Dahong: "I'm still not satisfied"
| script-title= zh:"三国"落幕 司马懿蹿红 倪大红:我还不满足
| date = 18 June 2010 |language= zh 
}}</ref> [[Eric Li (actor)|Eric Li]], in ''[[Three Kingdoms RPG]]'' (2012);<ref>{{cite web
| url = https://programme.tvb.com/tc/threekingdomsrpg_102373/%E5%9B%9E%E5%88%B0%E4%B8%89%E5%9C%8B | work= TVB
| script-title= zh:回到三國
| trans-title= Back to the Three Kingdoms
| language=zh |access-date=27 August 2023
}}</ref> [[Wu Xiubo]], in ''[[The Advisors Alliance]]'' (2017);<ref>{{cite web
|url = http://ent.chinadaily.com.cn/2017-11/24/content_34937464.htm
| script-title=zh:军师联盟之《虎啸龙吟》霸气回归定档12月8日，看吴秀波外征诸葛、内克劲敌
| trans-title= ''The Advisors Alliance'' episode "Growling Tiger, Roaring Dragon" returns in force for its finale on 8 December; watch Wu Xiubo contend with Zhuge on the outside, as he conquers interbal enemies <!-- i hate this help me --> | access-date=27 August 2023 | work = China Daily | date=24 November 2017 | language=zh 
}}</ref> and [[Elvis Han]], in ''[[Secret of the Three Kingdoms]]'' (2018).<ref>{{cite web | url = https://m.163.com/ent/article/DC75DBNC000380EN.html?spss=adap_pc 
|script-work= zh:網易娱乐
|script-title=zh:《三国机密之潜龙在渊》定档马天宇韩东君领衔 | date= 6 March 2018
|trans-title=''Secret of the Three Kingdoms'' finale: Ma Tianyu and Elvis Han lead
| author= Yang Wenjie (楊雯婕)
| language=zh}}</ref>

==See also==
* [[Family tree of Sima Yi]]
* [[Lists of people of the Three Kingdoms]]

==Notes==
{{Notelist|colwidth=30em}}

==References==
===Citations===
{{Reflist|colwidth=30em}}

===Sources===
* {{ cite book
| title = Annotated Records of the Three Kingdoms 
| title-link= Annotated Records of the Three Kingdoms
| script-title= zh:三國志注
| author= Chen Shou | author-link= Chen Shou
| editor=Pei Songzhi | editor-link=Pei Songzhi
| year = 1977 | orig-year=429
| publisher= Dingwen Printing
| place=Taipei
| ref={{sfnref|Chen and Pei|429}}
}} 
* {{cite book|last=de Crespigny|first=Rafe|author-link=Rafe de Crespigny|title=To Establish Peace: Being the Chronicle of Later Han for the years 189 to 220 AD as recorded in Chapters 59 to 69 of the Zizhi tongjian of Sima Guang|publisher=Faculty of Asian Studies, Australian National University|location=Canberra|year=1996|isbn=0-7315-2526-4}}
* {{cite book|last=de Crespigny|first=Rafe|author-link=Rafe de Crespigny|title=A Biographical Dictionary of Later Han to the Three Kingdoms (23–220 AD)|publisher=Brill|location=Leiden|year=2007|isbn=978-90-04-15605-0| doi = 10.1163/ej.9789004156050.i-1311.7}}
* {{cite book|last=de Crespigny|first=Rafe|author-link=Rafe de Crespigny|title=Imperial Warlord: A Biography of Cao Cao 155–220 AD|publisher=Brill|location=Leiden|year=2010|isbn=978-90-04-18522-7}}
* {{ cite book| author= Du You | author-link= Du You | script-title= zh:通典 | title= Tongdian | date= 801 | trans-title= Comprehensive Conspectus | ref= {{sfnref|Du, ''Tongdian''|801}} | title-link= Tongdian }}
* {{ cite book | translator-first=Achilles | translator-last= Fang|translator-link=Achilles Fang| date= 1952 | title=Chronicles of the Three Kingdoms | type=Translation of and Annotation to Chapters 69 to 78 of the ''Zizhi Tongjian'' from Sima Guang | ref= {{sfnref|Fang|1952}} }}
* {{ Cite book| title= Book of Jin | title-link= Book of Jin
| editor= Fang Xuanling
| editor-link= Fang Xuanling
| display-editors=etal
| orig-date= 648 | date= 1974
| publisher= Zhonghua Shuju| place= Beijing
| script-title= zh:晉書
| ref={{sfnref|Book of Jin|648}}
| chapter=[[:zh:s:晉書/卷001#宣帝|Volume 1: Imperial Annals 1, Emperor Xuan]]
}}
* {{ cite journal | last= Gardiner | first= Kenneth H.J. | url= https://openresearch-repository.anu.edu.au/bitstream/1885/155160/1/The%20Kung-Sun%20warlords.pdf | archive-url= https://web.archive.org/web/20190128083343/https://openresearch-repository.anu.edu.au/bitstream/1885/155160/1/The%20Kung-Sun%20warlords.pdf | archive-date= 28 January 2019| title= The Kung-sun Warlords of Liao-tung (189–238) | journal=Papers on Far Eastern History | volume= 5 | place= Canberra | date= March 1972 | pages= 59–107 | publisher= Australian National University | ref={{sfnref|Gardiner|1972a}} }}
* {{ cite journal| last=Gardiner | first= Kenneth H.J. | url= https://openresearch-repository.anu.edu.au/bitstream/1885/155160/8/The%20Kung-Sun%20warlords%20part%20two.pdf | title= The Kung-sun Warlords of Liao-tung (189–238) – Continued | journal=Papers on Far Eastern History | volume=6 |place=Canberra | date= September 1972 | pages= 14–201 | publisher= Australian National University| archive-url=https://web.archive.org/web/20190128083234/https://openresearch-repository.anu.edu.au/bitstream/1885/155160/8/The%20Kung-Sun%20warlords%20part%20two.pdf | archive-date= 28 January 2019 | ref={{sfnref|Gardiner|1972b}} }}
* {{cite book|author=Luo Guanzhong|author-link=Luo Guanzhong|script-title=zh:三國演義| trans-title=[[Romance of the Three Kingdoms]]|orig-date=1300s|location=Yonghe, Taiwan|publisher=Zhiyang Publishing House|year=1998 |language=zh | ref={{sfnref|Luo, ''Sanguo Yanyi''}} }}
* {{cite book |editor-last=Sakaguchi |editor-first= Wazumi |year=2005 |title=Seishi Sangokushi Gunyu Meimeiden| location=Tokyo|publisher= Kojinsha}} ({{lang|zh-hant|正史三國志群雄銘銘傳}}). .
* {{ cite book | editor = Sima Guang | editor-link= Sima Guang| title= Zizhi Tongjian | title-link= Zizhi Tongjian| orig-date= 1084 | date= 1934 | publisher= Zhonghua Shuju| place= Hong Kong | ref={{sfnref|Sima|1084}} }}
** [[:zh:s:資治通鑑/卷069|Volume 69: Annals of Wei 1]]
** [[:zh:s:資治通鑑/卷070|Volume 70: Annals of Wei 2]]
** [[:zh:s:資治通鑑/卷071|Volume 71: Annals of Wei 3]]
** [[:zh:s:資治通鑑/卷072|Volume 72: Annals of Wei 4]]
** [[:zh:s:資治通鑑/卷073|Volume 73: Annals of Wei 5]]
** [[:zh:s:資治通鑑/卷074|Volume 74: Annals of Wei 6]]
** [[:zh:s:資治通鑑/卷075|Volume 75: Annals of Wei 7]]
* {{cite book |editor-last=Watanabe |editor-first= Seiichi |year=2006 |title=Moichidomanabitai Sangokushi |location=Tokyo |publisher= Seitosha | script-title= ja:もう一度学びたい 三国志}}
* {{ cite book
| author = Xi Zuochi| author-link= Xi Zuochi
| title= Han–Jin Chunqiu 
| script-title= zh:漢晉春秋 
| trans-title= Chronicle of Han and Jin
| type = private history 
| ref = {{sfnref|Xi, ''Han–Jin Chunqiu''}}
}}
* {{ cite book
| ref = {{sfnref|Yao, ''Book of Chen''|636}}
| author= Yao Silian | author-link= Yao Silian
| title= Chen Shu | script-title=zh:陳書
| trans-title= Book of Chen | title-link= Book of Chen | date = 636
}}
* {{ cite book 
| author= Yu Huan
| author-link= Yu Huan
| title= [[Weilüe]]
| script-title=zh:魏略
| date= 265
| ref={{sfnref|Yu, ''Weilüe''}}
| type= private history 
| trans-title= A Brief History of the Wei Dynasty 
}}
* {{ cite book | author=Yu Shinan | author-link= Yu Shinan | date= 1888 | orig-date= 600s | title=Beitang Shuchao | script-title=zh:北堂書鈔 | title-link=:zh:北堂書鈔 | ref= {{sfnref|Yu, ''Beitang Shuchao''}} }}

==External links==
{{Commons category-inline|Sima Yi}}

{{People of Cao Wei}}
{{Authority control}}

{{DEFAULTSORT:Sima, Yi}}
[[Category:179 births]]
[[Category:251 deaths]]
[[Category:3rd-century regents]]
[[Category:Cao Wei generals]]
[[Category:Cao Wei regents]]
[[Category:Deified Chinese men]]
[[Category:Generals from Henan]]
[[Category:Government officials under Cao Cao]]
[[Category:Military strategists]]
[[Category:Politicians from Jiaozuo]]
[[Category:Political office-holders in Henan]]
[[Category:Three Rebellions in Shouchun]]
[[Category:Leaders who took power by coup]]
[[Category:Palace Attendants]]