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{{short description|Army units of the Spanish Empire}}
{{about||the bullfighting term|Spanish-style bullfighting|a more general article on early combined arms practices|Pike and shot|the ''Tercio de Extranjeros''|Spanish Legion}}
{{see also|Tercio, Colorado}}

{{Infobox military unit
| unit_name                     = Spanish Tercios
| image                         = Flag of Cross of Burgundy.svg
| image_size                    = 150px
| dates                         = 
| country                       = [[Spain]]{{collapsible list
 | titlestyle = background:transparent;text-align:left;font-weight:normal;
 | title = ''See details''
|[[Habsburg Spain]]<small> (1534-1704)</small>}}
| type                          = [[Infantry]]
| role                          = [[Close combat]]<br />[[Hand-to-hand combat]]<br />[[Hedgehog defence]]<br />[[Pike square]]<br />[[Raid (military)|Raiding]]<br />[[Volley fire]]
| command_structure             = [[Spanish Armed Forces]]
| garrison                      = 
| garrison_label                = 
| nickname                      = 
| patron                        = [[Ferdinand II of Aragon|Ferdinand II]]<br />[[Charles V, Holy Roman Emperor]]<br />[[Philip II of Spain]]<br />[[Philip III of Spain]]<br />[[Philip IV of Spain]]<br />[[Charles II of Spain]]<br />[[Charles VI, Holy Roman Emperor]]
| motto                         = ''Spain my nature, Italy my fortune, Flanders my grave''{{Citation needed|date=October 2024}}
| colours                       = 
| colours_label                 = 
| march                         = 
| mascot                        = 
| equipment                     = [[Arquebuses]], [[muskets]], and [[Pike (weapon)|pikes]]
| equipment_label               = 
| battles                       = 
| anniversaries                 = 
| decorations                   = 
| battle_honours                = <!-- Gran Capitám -->
| website                       = {{Official URL}}
| commander1_label              = Gran Capitán
| commander1                    = [[Gonzalo Fernández de Córdoba]]
| commander2_label              = Comandante
| commander3                    = 
| commander3_label              = 
| commander4                    = 
| commander4_label              = 
| commander2                    = [[John of Austria]]<ref>{{London Gazette|issue= 62738|supp=y|page=14447|date=13 August 2019}}</ref> <br />[[Emmanuel Philibert, Duke of Savoy]]<ref>{{London Gazette|issue= 62738|supp=y|page=14447|date=13 August 2019}}</ref>
| identification_symbol         = [[File:Flag of Cross of Burgundy.svg|centre|border|100px]]
| identification_symbol_label   = {{nowrap|[[War flag]]}}
| start_date                    = {{start date and age|1534|1|1|df=yes}} (''de jure'' establishment)
}}
{{Use British English|date=August 2019}}
{{Use dmy dates|date=March 2021}}
{{italic title}}
A '''''tercio''''' ({{IPA|es|ˈteɾθjo|pron}}), Spanish for "[a] third") was a military unit of the [[Spanish Army]] during the reign of the [[Catholic Monarchs of Spain]] and [[Habsburg Spain]] in the [[early modern period]]. They were the elite military units of the [[Monarchy of Spain|Spanish monarchy]] and essential pieces of the powerful land forces of the [[Spanish Empire]], sometimes also fighting along with the [[Spanish navy|navy]]. These forces were among the most dominant in the [[Europe|European]] battlefields for more than a century and a half.<ref>{{cite book |last=Heath |first=Ian |title=The Spanish Tercios 1536–1704 |series=Men-at-Arms |publisher=Osprey Publishing |location=Oxford |year=2012}}</ref>

The Spanish ''tercios'' were some of the finest and most influential professional infantry forces in the world due to the effectiveness of their battlefield formations, and were the crucial step in the formation of modern European armies, made up of professional volunteers, instead of [[conscription|levies]] raised for a campaign or hired [[mercenary|mercenaries]] typically used by other European countries of the time.{{sfnp|Rogers|2010|p=40}}{{sfnp|Montgomery|1983|p=219}}

The internal administrative organization of the ''tercios'' and their battlefield formations and tactics grew out of the innovations of [[Gonzalo Fernández de Córdoba]] during the [[conquest of Granada]] and the [[Italian Wars]] in the 1490s and 1500s, being among the first to effectively mix [[pike and shot|pikes and firearms]] ([[arquebus]]es). The ''tercios'' marked a rebirth of the use of [[infantry]] forces comparable to the [[Macedonian phalanx]]es and the [[Roman legions]].<ref>"... y, con el Gran Capitán, la aparición ni más ni menos que del tercio español, de algo que equivale en la historia universal al nacimiento de la falange Macedonia o de la legión romana." Fernand Braudel, ''El Mediterráneo y el mundo mediterráneo en la época de Felipe II'', tomo II, p. 28, FCE, 1.976.</ref> Such formations distinguished themselves in famous battles such as the [[Battle of Bicocca]] (1522) and the [[Battle of Pavia]] (1525). Following their formal establishment in 1534, the reputation of the ''tercio'' was built upon their effective training and high proportion of "old soldiers" (''veteranos''), in conjunction with the particular elan imparted by the [[lower nobility]] who commanded them. The ''tercios'' were finally replaced by other regiments in the early eighteenth century.
 
From 1920, the name of ''tercio'' was given to the formations of the newly created [[Spanish Legion]], professional units then created to fight colonial wars in [[North Africa]], similar to the [[French Foreign Legion]]. These formations were actually [[regiment]]s bearing the name of ''tercio'' as an honorary title.

==History==
[[File:Velázquez - de Breda o Las Lanzas (Museo del Prado, 1634-35).jpg|thumb|350px|''[[Surrender of Breda]]'', by [[Diego Velázquez|Velázquez]], shows [[Ambrosio Spinola]] (at right), commander of a Spanish ''tercio'', receiving the keys to the city from a defeated Dutch general in 1625.]]
[[File:Desembarcoislasterceiras.jpg|thumb|Tercios disembarking, 1583]]

During the [[Granada War]] (1482–1491), the soldiers of the [[Catholic Monarchs of Spain]] were divided into three classes: [[Pike (weapon)|pikemen]] (modelled after the [[Swiss mercenaries|Swiss]]), [[sword]]smen with [[shield]]s, and [[crossbow]]men supplemented with an early [[firearm]], the [[arquebus]].{{citation needed|date=March 2022}} As shields disappeared and firearms replaced crossbows, Spain won victory after victory in Italy against powerful French armies, starting under the leadership of [[Gonzalo Fernández de Córdoba]] (1453–1515), nicknamed ''El Gran Capitán'' (''The Great Captain'').{{sfnp|Notario López|Notario Lopez|Embleton|Embleton|2012|pp=3–5}} The military organizational and tactical changes made by Córdoba to the armies of Spanish monarchs are seen as the precursors of the tercios and their methods of warfare.{{citation needed|date=March 2022}} The combat effectiveness of the Spanish [[pike and shot]] armies pioneered by Córdoba was based on an armament system that effectively united the pike with the compact firepower of the arquebus. An advantage of the Spanish pike and shot formation over its inspiration, the Swiss compact frame, was its ability to divide into mobile units and even individual melee units without the loss of cohesion.{{citation needed|date=March 2022}}

Initially, the term ''tercio'' denoted not a combat unit, but an administrative unit under a general staff, commanding garrisons throughout Italy for battles on various distant fronts.{{sfnp|De Mesa Gallego|2009|p=195}} This peculiar character was maintained when it mobilized to fight the Protestant rebels in Flanders. Command of a tercio and its companies of soldiers was granted directly by the king, and companies could easily be added or removed and moved between tercios.{{citation needed|date=March 2022}} By the middle of the 17th century, the tercios began to be raised by nobles at their own expense, patrons who appointed the captains and were effective owners of the units, as in other contemporaneous European armies.

From the conquest of Granada in 1492 to the campaigns of ''El Gran Capitán'' in the kingdom of [[Naples]] in 1495, three ordinances laid the foundations of Spanish military administration. In 1503, the ''Great Ordinance'' reflected the adoption of the long pike and the distribution of infantry in specialized companies.{{citation needed|date=March 2022}} In 1534, the first official ''tercio'' was created, that of [[Lombardy]], and a year later it helped in the conquest of the [[Duchy of Milan]]. The ''tercios'' of Naples and Sicily were created in 1536, thanks to the Genoa ordinance of [[Charles V, Holy Roman Emperor|Charles V]].<ref>{{cite book |title=Handbook for Marine NCOs |author1=Estes, Kenneth W. |author2=Heinl, Robert Debs |publisher=Naval Institute Press |year=1995 |isbn=1-55750-238-2}}</ref><ref>{{cite web |url=http://www.revistanaval.com/infanteriademarina/historia.htm |title=Historia de La Infanteria de Marina |publisher=[[Spanish Navy Marines]] |language=es |access-date=7 February 2010}}</ref>

At the [[Battle of Mühlberg]] in 1547, the imperial troops of Charles V defeated a league of Protestant princes in Germany, thanks mainly to the action of the Spanish ''tercios''.{{citation needed|date=March 2022}} In 1557, the Spanish army completely defeated the French at the [[Battle of St. Quentin (1557)|Battle of San Quentin]], and again in 1558 at [[Battle of Gravelines (1558)|Gravelines]], which led to a peace greatly favoring Spain. In all these battles, the effectiveness of the ''tercio'' units stood out.

The origin of the term ''tercio'' is doubtful. Some historians believe the name was inspired by the ''tercía'', a [[Roman Legion]] of Hispania.{{cn|date=September 2023}} Some{{who|date=September 2023}} think that it designated the threefold division of the Spanish forces in Italy. Others{{who|date=September 2023}} trace it to the three types of combatants (pikemen, harquebusiers, musketeers). According to an ordinance for "people of war" of 1497, where the formation of the infantry is changed into three parts.
<blockquote>The pawns [the infantry] were divided into three parts. The one tercio with spears, as the Germans brought them, which they called pikes; and the other had the name of shields [people of swords]; and the other, of crossbowmen and spit bearers. [later replaced by arquebusiers].</blockquote>

Yet others{{who|date=September 2023}} derive the name from the three thousand men mustered in the first units. This last explanation is supported by the field master [[Sancho de Londoño]] in a report to the Duke of Alba in the 16th century:
<blockquote>The tercios, although they were instituted in imitation of the [Roman] legions, in few things can be compared to them, that the number is half, and although formerly there were three thousand soldiers, for which they were called tercios and not legions, already it is said like this even if they do not have more than a thousand men.<ref>Londoño, Sancho de: [https://books.google.com/books?id=gyRaAAAAcAAJ&pg=PT32 ''Discurso sobre la forma de reducir la disciplina militar a mejor y antiguo estado''], p. 14.</ref></blockquote>

==Composition and characteristics==
[[File:Tercio.jpg|thumb|A bastioned square in battle]]

Although other powers adopted the battle formations and tactics perfected by the ''tercios'', their armies fell short of the fearsome reputation of the Spanish army, which possessed a core of experienced professional soldiers.<ref>Lynch, John (1992). ''The Hispanic World in Crisis and Change, 1578–1700''. Cambridge: Blackwell, p. 117.</ref> This army was further supplemented by "an army of different nations", a reference to the varied origins of the troops from the [[Holy Roman Empire|German]] and [[List of historic states of Italy#After the Italian Wars (1494–1559)|Italian]] states, the [[Spanish Netherlands]], and smaller units from other countries such as [[Kingdom of Ireland|Ireland]]. In 1621, for example, of the 47 military units of the Spanish army, counting together the larger Spanish, Spanish Netherlands, and Italian ''tercios'', and the much smaller German, [[Free County of Burgundy|Burgundian]], and Irish regiments,{{sfnp|de Mesa|2014|p=70}} only seven were manned by troops of Spanish origin.{{sfnp|Notario López|Notario Lopez|Embleton|Embleton|2012|p=7}} Such international musters were characteristic of European warfare before the levies of the [[Napoleonic Wars]]. However, the core Spanish troops were Spanish subjects, admired for their cohesiveness, superior discipline, and overall professionalism.{{sfnp|Davies|1937|p=123-124}}

=== Organization ===
Initially, each ''tercio'' that served in Italy and the Spanish Netherlands was organized into:

* 10 companies of 300 soldiers each led by captains, in which
** 8 were pikemen's companies
** 2 were of arquebusier companies

The companies were later reduced to 250 men and the ratio of arquebusiers (later musketmen) to pikemen steadily increased.

During the early actions in the Netherlands, the ''tercios'' were reorganized into three ''coronelias'' ("colonelcies"), led by ''coronels'' ("colonels") each composed of a headquarters unit and four companies each (the predecessor of today's [[battalion]]s), but as a whole continued to be subdivided into the same 10 companies of 250 personnel each: two of arquebusiers and 8 of pikemen. Colonels were also of royal appointment.

=== Staff ===
[[File:Organización de un tercio.jpg|thumb|Organization of a tercio]]
[[File:Tercio piquiers.jpg|thumb|Schematic depiction of the pikemen's combat drill.]]
* ''Maestre de Campo'' – [[colonel]] 
* ''Coronel'' – colonel/[[lieutenant colonel]]
* ''[[Sargento mayor]]'' – [[Major (rank)|major]]
* ''Furriel mayor'' – [[quartermaster]]
* ''Capellán mayor'' – [[chaplain]]
* ''Pifano mayor'' – [[Fife (instrument)|fife major]]
* ''Tambor mayor'' – [[Drum major (military)|drum major]]

=== Company ===
* 1 ''Capitán'' – [[Captain (armed forces)|captain]]
* 1 ''Alférez'' – [[lieutenant]]
* ''Abanderado'' – [[standard-bearer]]
* ''Sargento'' – [[sergeant]]
* ''Capellán'' – chaplain
* ''Furriel'' – quartermaster
* ''Tambor'' – drummer
* ''Pifano'' – fifer
* ''Barbero'' – [[barber surgeon]]
* ''Cabos de escuadra'' – [[corporal]]s
* 150 ''piqueros'' – [[pikemen]]
* 100 ''arcabuceros'' – [[arquebus]]iers (later musketeers)
* 40 ''coseletes'' – sword-and-buckler men

=== Leadership of the ''tercio'' ===
[[File:1650 - tercio.jpg|thumb|Soldiers of a ''tercio'': a pikeman, a standard-bearer and a musketeer]]

Similar to military organization today, a ''tercio'' was led by a [[Maestre de Campo|''maestre de campo'']] (commanding officer) appointed by the king, with a guard of eight halberdiers. Assisting the maestre was the [[sergeant major]] and a [[furir]] major in charge of logistics and armaments. Companies were led by a [[Captain (armed forces)|captain]] (also royally appointed), with an [[Ensign (rank)|ensign]] in charge of the company color.

The company non-commissioned officers were [[sergeant]]s, ''furrieles'' (furirs) and [[corporal]]s. A sergeant served as second-in-command of a company and transmitted the captain's orders; furrieles provided weapons and munitions, as well as additional manpower; corporals led groups of 25 (similar to today's [[platoon]]s), watching for disorder in the unit.

Each company had [[corps of drums]] made up of drummers and fifers, sounding duty calls in battle, with the [[Drum major (military)|drum major]] and [[Fife (instrument)|fife major]] being provided by the ''tercio'' headquarters.

The ''tercio'' staff included a medical component (made up of a professional medic, a barber, and surgeons), chaplains and preachers, and a judicial unit, plus military [[constable]]s enforcing order. They all reported directly to the ''[[maestre de campo]]''.

=== Battle formations ===
[[File:Tercio 1.jpg|thumb|A training schematic of a ''tercio'' in bastioned square formation, circa 1600]]
Within a ''tercio''<nowiki/>'s squares, ranks of pikemen assembled into a hollow [[pike square]] (''cuadro'') containing swordsmen – typically with short sword, buckler, and javelins. As firearms rose in prominence, the swordsmen were phased out. The arquebusiers (later, musketeers) were usually split up in several mobile groups called "sleeves" (''mangas''), typically deployed with one ''manga'' at each corner of the ''cuadro''.{{Citation needed|date=February 2007}} By virtue of this combined-arms approach, the formation simultaneously enjoyed the staying power of its pike-armed infantry, the ranged firepower of its arquebusiers, and the striking power of its sword-and-buckler men. However, as the formation matured in practice, the number of swordsmen was reduced, then eliminated and the ratio of gunmen to pikemen increased over time. In addition to its defensive ability to repulse [[cavalry]] and other forces along its front, the long-range fire of its arquebusiers could be easily shifted to the flanks, making it versatile in both attack and defense.

[[File:Terciosmarchando.jpg|thumb|''Tercio'' companies advancing at the [[Battle of Nieuwpoort]]]]
Groups of squares were typically arrayed in dragon-toothed formation, staggered, with the leading edge of one unit level with the trailing edge of the preceding, similar to [[hedgehog defence]]. This enabled [[Enfilade and defilade#Enfilade|enfilade]] lines of fire and somewhat [[Enfilade and defilade#Defilade|defiladed]] the army units themselves. Odd units stood forward, alternating with even units stepped back, providing gaps for an unwary enemy to enter and expose its flanks to raking [[crossfire]] from the guns of three separate squares. ''Tercio'' companies also conducted some operations independently of the main formations.

=== ''Tercios'' and the Spanish Empire ===
''Tercios'' were deployed all over Europe under the [[Habsburg]] rulers. They were made up of volunteers and built up around a core of professional soldiers and were highly trained. Sometime later ''tercios'' did not conform to the all-volunteer model of the regular Imperial Spanish army – when the Habsburg king [[Philip II of Spain|Philip II]] found himself in need of more troops, he raised a ''tercio'' of [[Catalan people|Catalan]] criminals to fight in [[Flanders]],<ref>Lynch, John (1964). ''Spain Under the Habsburgs, Volume One: Empire and Absolutism, 1516 to 1598''. Oxford: Blackwell, p. 109.</ref> a trend he continued with mostly Catalan criminals for the rest of his reign.<ref>Lynch. ''Spain Under the Habsburgs'', p. 200.</ref> A large proportion of the Spanish army, the [[Tercio of Savoy|''Tercio'' of Savoy]] and the ''Tercio'' of Sicily were deployed in the Netherlands to quell the increasingly difficult [[Dutch Revolt|rebellion]] against the Habsburgs in the later half or the 16th century. By this time, the Spanish army was entirely composed of ''tercio'' units. Ironically, many units of the Spanish ''tercios'' became part of the problem, rather than the solution when the time came to pay them: with the Spanish coffers depleted by constant warfare, unpaid units often mutinied. For example, in April 1576, just after winning a major victory,{{specify|date=September 2023}} unpaid ''tercios'' mutinied and occupied the friendly town of [[Antwerp]], in the so-called [[Spanish Fury at Antwerp]], and sacked it for three days.<ref>Israel, ''The Dutch Republic'', p. 185.</ref> Completely reliant on his troops, the Spanish commander could only comply.<ref>Lynch. ''Spain Under the Habsburgs'', p. 284.</ref>

=== Specialized ''tercios'' ===
On 24 February 1537, the ''Tercio de Galeras'' (''Tercio'' of Galleys) was created. Today, the ''Real Infantería de Marina'' ([[Spanish Marine Infantry]]) consider themselves successors of the legacy and heritage of the Galleys ''Tercio'', making it the oldest currently operating marines unit in the world. There were other units of naval ''tercios'' such as ''Tercio Viejo de Armada'' (Old Navy ''Tercio'') or ''Tercio Fijo de la Mar de Nápoles'' (Permanent Sea ''Tercio'' of Naples). Such specialized units were needed for the protracted war with the [[Ottoman Empire]] over the entire [[Mediterranean]].

=== Naming conventions ===
Most ''tercios'' were named according to the place where they were raised or first deployed: ''Tercio de Sicilia'', ''de Lombardía'', ''de Nápoles'' (''Tercio'' of Sicily, of Lombardy, of Naples) and so on. Other ''tercios'' were named for their commanding officer, such as ''Tercio de Moncada'' for its commander Miguel de Moncada (whose most famous soldier was [[Miguel de Cervantes]]). Some tercios were named by their main function, such as ''Galeras'' or ''Viejo de Armada''.

=== Colours ===
<gallery>
File:Cross of Burgundy (Template).svg|The [[Cross of Burgundy]] was adopted as the symbol of the ''Tercios'' and the Spanish Empire.
File:Tercio - Liga.svg|''Tercio de la Liga'' (1571)
File:Tercio - Spínola.svg|''Unknown Tercio flag (appears near commander Ambrogio Spinola in the painting "The Surrender of Breda" of Diego Velázquez)'' (1621)
File:Tercio - Alburquerque.svg| ''Tercio de Alburquerque'' (1643)
File:Tercio - Morados Viejos.svg| ''Tercio Morados Viejos'' (1670)
File:Tercio - Amarillos Viejos.svg| ''Tercio Amarillos Viejos'' (1680)
</gallery>

==The Portuguese ''terços''==
[[Image:Lagos46 kopie.jpg|thumb|Portuguese ''terços'' in the Battle of Alcácer Quibir (1578)]]
[[Portugal]] adopted the Spanish model of ''tercio'' in the 16th century, calling it '''''terço'''''. In 1578, during the reorganization of the [[Portuguese Army]] conducted by King [[Sebastian of Portugal|Sebastian]], four ''terços'' were established:

* the ''Terço'' of [[Lisbon]],
* the ''Terço'' of [[Estremadura Province (historical)|Estremadura]],
* the ''Terço'' of [[Alentejo]],
* the ''Terço'' of [[Algarve]].

Each had about 2,000 men, formed into eight companies.

The infantry of the army organized for the expedition to [[Morocco]] in 1578 was made up of these four ''terços'', together with the ''Terço'' of the Adventurers (made up entirely of young nobles), three mercenary ''terços'' (the German, the Italian, and the Castilian), and a unit of elite [[sharpshooter]]s of the Portuguese garrison of [[Tangier]]. This was the Portuguese force which fought the [[Battle of Alcácer Quibir]].

While [[Iberian Union|united]] with the Spanish Crown, from 1580 to 1640, Portugal kept the organization of ''terços'', although the Army had declined. Several Spanish ''tercios'' were sent to Portugal; the principal of them, the Spanish infantry ''Tercio'' of the City of Lisbon, occupied the main fortresses of the Portuguese capital. The ''Terço'' of the Navy of the Crown of Portugal, the ancestor of the modern [[Portuguese Marines]], was created in this period.

After the restoration of [[Independence of Portugal|Portuguese sovereignty]] in 1640, the Army was reorganized by King [[John IV of Portugal]]. The terços remained the basic units of the Portuguese infantry. Two types of ''terços'' were organized: the paid ''terços'' (first line permanent units) and the auxiliary ''terços'' (second line militia units). Portugal won the [[Portuguese Restoration War|Restoration War]] with these ''terços''.

At the end of the 17th century, the ''terços'' were already organized as modern regiments. However, the first line ''terços'' were only transformed into regiments in 1707, during the [[War of the Spanish Succession]] – after the Spanish ''tercios'' were transformed into regiments in 1704. The second line ''terços'' were only transformed into militia regiments in 1796. Some of the old ''terços'' are direct ancestors of modern regiments of the Portuguese Army.

==Evolution and replacement==
[[File:Rocroi, el último tercio, por Augusto Ferrer-Dalmau.jpg|thumb|right|The [[Battle of Rocroi]] (1643) is often seen as the end of the battlefield supremacy of the ''tercios''. (Painting by [[Augusto Ferrer-Dalmau]] [[:es:Rocroi, el último tercio|picture]])]]

The first real challenge to the dominance of the Spanish ''tercios'' on the open battlefield came at the [[Battle of Nieuwpoort]] (1600). The victor of Nieuwpoort, the Dutch ''stadtholder'' [[Maurice, Prince of Orange]], believed he could [[Military Revolution#Linear tactics|improve on the ''tercio'' by combining its methods]] with the organisation of the [[Roman legion]]. These shallower linear formations brought a greater proportion of available guns to bear on the enemy simultaneously. The result was that the tercio squares at Nieuwpoort were badly damaged by the weight of Dutch firepower. Yet the Spanish army very nearly succeeded, in spite of internal dissensions that had compromised its regular command. The [[Eighty Years' War]] (1568–1648) in the [[Low Countries]] continued to be characterized by sieges of cities and forts, while field battles were of secondary importance. Maurice's reforms did not lead to a revolution in warfare, but he had created an army that could meet the ''tercios''<nowiki/>' battle formations on an even basis and that pointed the way to future developments. During the [[Thirty Years War]] (1618–1648) ''tercio'' style battle formations of the Holy Roman Empire suffered major defeats at the hands of more linear formations created and led by the Swedish soldier-king [[Gustavus Adolphus]]. However, the tried-and-true tactics and professionalism of the Spanish ''tercios'' played a decisive role in defeating the Swedish army at the [[Battle of Nördlingen (1634)|Battle of Nördlingen]].<ref>{{cite book|last1=Laínez|first1=Fernando Martínez|title=Vientos de Gloria : grandes victorias de la historia de España|date=2011|publisher=Espasa|location=Madrid|isbn=9788467035605}}</ref>

Throughout its history, the ''tercios''<nowiki/>' composition and battlefield formations and tactics evolved to meet new challenges. The classic pike and shot square formations fielded by the Spanish ''tercios'' and good cavalry support continued to win major battles in the 17th century, such as [[Battle of Wimpfen|Wimpfen]] (1622), [[Battle of Fleurus (1622)|Fleurus]] (1622), [[Siege of Breda (1624)|Breda]] (1624), [[Battle of Nördlingen (1634)|Nördlingen]] (1634), [[Relief of Thionville|Thionville]] (1639), and [[Battle of Honnecourt|Honnecourt]] (1641). It was not until [[Battle of Rocroi|Rocroi]] (1643) that the Spanish ''tercio's'' reputation of invincibility in open battle was shattered. Still, the Rocroi defeat was precipitated by the collapse of the supporting cavalry rather than the failure of the ''tercios''<nowiki/>' infantry. Even then, the ''tercios'' continued to win battles immediately after Rocroi, such as at [[Battle of Tuttlingen|Tuttlingen]] (1643) and [[Battle of Valenciennes (1656)|Valenciennes]] (1656), although their composition and battlefield style had continued to evolve. In this period steady improvements in firearms and field artillery were increasingly favoring the linear style. By the late 17th century the ''tercios'' had adopted so much of the linear style that their battlefield formations and tactics often had little resemblance to the battle formations and tactics a century earlier.

=== Royal Military and Mathematics Academy of Brussels ===
In 1675 the first modern [[Royal Military and Mathematics Academy of Brussels]] was founded in [[Brussels]]  by its sole-director Don [[Sebastián Fernández de Medrano]], at the request of the [[List of governors of the Habsburg Netherlands|Governor of the Habsburg Netherlands]], [[Carlos de Aragón de Gurrea, 9th Duke of Villahermosa]], in order to correct the shortage of [[Artillery|artillerymen]] and engineers from the Spanish ''tercios''.<ref>{{Cite web |title=Francisco de Medrano y Bazán {{!}} Real Academia de la Historia |url=https://dbe.rah.es/biografias/34559/francisco-de-medrano-y-bazan |access-date=2024-06-22 |website=dbe.rah.es}}</ref>

This Royal Military and Mathematics Academy in Flanders was renowned for the diverse origin of its officer cadets, for the innovative features of its plan of studies produced by Sebastián Fernández de Medrano, the theoretical and practical basis of its learning process apart from the relevant assignments given to its officer cadets who were also known as the “Great Masters of War” coined by the treatise writer, Count of Clonard. It was created in Brussels to train the most distinguished officers in the peninsula in the Art of War.<ref>{{Cite web |title=Contenido - Spanish army |url=https://ejercito.defensa.gob.es/en/unidades/Zaragoza/agm/Historial/index.html |access-date=2023-08-16 |website=ejercito.defensa.gob.es}}</ref>

The Royal Military Academy of Flanders was an educational institution to train military engineers with various fields of education such as arithmetic, geometry, artillery, fortification, algebra, cosmography, astronomy, navigation, etc.<ref>{{Cite book |last=Geográfica (Spain) |first=Real Sociedad |url=https://play.google.com/store/books/details?id=FBI2AQAAMAAJ |title=Boletín |date=1906 |language=es}}</ref>

=== Transformation of the Spanish ''Tercio'' ===
In 1704, the regular Spanish ''tercios'' were transformed into regiments and the pikeman as an infantry type was dropped. Those of the reserves and the militia would later be transformed into similar organisations.

==Famous battles==
===Victories===
====Pre-official nomenclature====
{{Columns-start}}
* [[Battle of Cerignola|Cerignola]] (1503)
* [[Battle of Garigliano (1503)|Garigliano]] (1503)
* [[Capture of Mers-el-Kébir (1505)|Mers-el-Kébir]] (1505)
* [[Spanish conquest of Oran (1509)|Oran]] (1509)
* [[Battle of La Motta (1513)|La Motta]] (1513)
* [[Battle of Noáin|Noáin]] (1521)
{{Column}}
* [[Battle of Bicocca|Bicocca]] (1522)
* [[Battle of the Sesia (1524)|Sesia]] (1524)
* [[Battle of Pavia|Pavia]] (1525)
* [[Sack of Rome (1527)|Rome]] (1527)
* [[Battle of Landriano|Landriano]] (1529)
* [[Siege of Vienna (1529)|Vienna]] (1529)
* [[Battle of Gavinana|Gavinana]] (1530)
{{Columns-end}}

====Official nomenclature====
{{Columns-start}}
* [[Conquest of Tunis (1535)|Tunis]] (1535)
* [[Battle of Serravalle (1544)|Serravalle]] (1544)
* [[Battle of Muhlberg|Mühlberg]] (1547)
* [[Battle of St. Quentin (1557)|St. Quentin]] (1557)
* [[Battle of Gravelines (1558)|Gravelines]] (1558)
* [[Great Siege of Malta|Malta]] (1565)
* [[Battle of Lannoy|Lannoy]] (1566)
* [[Battle of Dahlen|Dahlen]] (1566)
* [[Battle of Oosterweel|Oosterweel]] (1567)
* [[Battle of Jemmingen|Jemmingen]] (1568)
* [[Battle of Jodoigne|Jodoigne]] (1568)
* [[Battle of Lepanto|Lepanto]] (1571)
* [[Siege of Mons (1572)|Mons]] (1572)
* [[Relief of Goes|Goes]] (1572)
* [[Siege of Haarlem|Haarlem]] (1573)
* [[Battle of Mookerheyde|Mook]] (1574)
* [[Capture of Valkenburg (1574)|Valkenburg]] (1574)
* [[Siege of Schoonhoven (1575)|Schoonhoven]] (1575)
* [[Siege of Oudewater (1575)|Oudewater]] (1575)
* [[Siege of Zierikzee|Zierikzee]] (1576)
* [[Battle of Gembloux (1578)|Gembloux]] (1578)
* [[Battle of Borgerhout|Borgerhout]] (1579)
* [[Siege of Maastricht (1579)|Maastricht]] (1579)
* [[Battle of Alcântara (1580)|Alcantara]] (1580)
* [[Battle of Noordhorn|Noordhorn]] (1581)
* [[Battle of Vila Franca do Campo|Terceira]] (1582)
* [[Siege of Eindhoven (1583)|Eindhoven]] (1583)
* [[Battle of Steenbergen (1583)|Steenbergen]] (1583)
* [[Battle of Empel|Empel]] (1585)
* [[Fall of Antwerp|Antwerp]] (1585)
* [[Destruction of Neuss|Neuss]] (1586)
{{Column}}
* [[Battle of Zutphen|Zutphen]] (1586)
* [[Siege of Sluis (1587)|Sluis]] (1587)
* [[Siege of Rheinberg (1586–90)|Rheinberg]] (1590)
* [[Siege of Paris (1590)|Paris]] (1590)
* [[Battle of Craon|Craon]] (1592)
* [[Siege of Doullens|Doullens]] and [[Siege of Groenlo (1595)|Groenlo]] (1595)
* [[Battle of the Lippe|Lippe]] (1595)
* [[Siege of Calais (1596)|Calais]] (1596)
* [[Siege of Groenlo (1606)|Groenlo]] (1606)
* [[Capture of Oppenheim|Oppenheim]] (1620)
* [[Capture of Bacharach|Bacharach]] (1620)
* [[Siege of Jülich (1621–1622)|Jülich]] (1621)
* [[Battle of Wimpfen|Wimpfen]] (1622)
* [[Battle of Fleurus (1622)|Fleurus]] (1622)
* [[Siege of Heidelberg (1622)|Heidelberg]] (1622)
* [[Battle of Höchst|Höchst]] (1622)
* [[Capture of Mannheim|Mannheim]] (1622)
* [[Siege of Breda (1624)|Breda]] (1625)
* [[Cádiz expedition (1625)|Cádiz]] (1625)
* [[Relief of Genoa|Genoa]] (1625)
* [[Recapture of Salvador|Salvador de Bahia]] (1625)
* [[Battle of Nördlingen (1634)|Nördlingen]] (1634)
* [[Siege of Leuven|Leuven]] (1635)
* [[Crossing of the Somme|Somme]] (1636)
* [[Siege of Venlo (1637)|Venlo]] (1637)
* [[Battle of Kallo|Kallo]] (1638)
* [[Relief of Thionville|Thionville]] (1639)
* [[Battle of Honnecourt|Honnecourt]] (1642)
* [[Battle of Tuttlingen|Tuttlingen]] (1643)
* [[Battle of Valenciennes (1656)|Valenciennes]] (1656)
{{Columns-end}}

===Defeats===
{{Columns-start}}
* [[Battle of Ravenna (1512)|Ravenna]] (1512)
* [[Siege of Castelnuovo|Castelnuovo]] (1539)
* [[Algiers expedition (1541)|Algiers]] (1541)
* [[Battle of Ceresole|Ceresole]] (1544)
* [[Siege of Leiden|Leiden]] (1574)
* [[Battle of Rijmenam (1578)|Rijmenam]] (1578)
* [[Battle of Alcácer Quibir|Alcácer Quibir]] (1578)
* [[Battle of Ivry|Ivry]] (1590)
* [[Siege of Caudebec|Caudebec]] (1592)
* [[Siege of Coevorden (1592)|Siege of Coevorden]]
* [[Siege of Morlaix (1594)|Morlaix]] (1594)
* [[Siege of Fort Crozon|Fort Crozon]] (1594)
* [[Battle of Fontaine-Française|Fontaine-française]] (1595)
* [[Siege of Amiens (1597)|Amiens]] (1597)
* [[Battle of Turnhout (1597)|Turnhout]] (1597)
* [[Siege of Zaltbommel|Zaltbommel]] (1599)
{{Column}}
* [[Battle of Nieuwpoort|Nieuwpoort]] (1600)
* [[Siege of Kinsale|Kinsale]] (1601)
* [[Siege of Sluis (1604)|Sluis]] (1604)
* [[Battle of Les Avins|Les Avins]] (1635)
* [[Battle of Tornavento|Tornavento]] (1636)
* [[Siege of Schenkenschans|Schenkenschans]] (1636)
* [[Siege of Turin (1640)|Turin]] (1640)
* [[Battle of Montjuïc (1641)|Montjuïc]] (1641)
* [[Battle of Lleida (1642)|Lleida]] (1642)
* [[Battle of Rocroi|Rocroi]] (1643)
* [[Battle of Lens|Lens]] (1648)
* [[Battle of Arras (1654)|Arras]] (1654)
* [[Battle of the Dunes (1658)|The Dunes]] (1658)
* [[Battle of the Lines of Elvas|The Lines of Elvas]] (1659)
* [[Battle of Ameixial|Ameixial]] (1663)
* [[Battle of Castelo Rodrigo|Castelo Rodrigo]] (1664)
* [[Battle of Montes Claros|Montes Claros]] (1665)
{{Columns-end}}

== See also ==
* [[Pike and shot]]
* [[Musketeer]]
* ''[[Captain Alatriste]]''
* [[Military history]]
* [[Spanish Navy Marines]] units are called ''tercios''
* The units of the modern [[Spanish Legion]] are also called ''tercios''.
* {{interlanguage link|Sonae (military unit)|ja|備}}, roughly contemporaneous and organizationally similar Japanese unit

== References ==
{{reflist|30em}}

=== Further reading ===
{{refbegin}}
* Christon I. Archer, John R. Ferris, Holger H. Herwig, Timothy H. E. Travers – For a history of Spanish arms in the 16th and 17th centuries.
* {{cite book |last=Davies |first=Reginald Thorne |title=The Golden Century of Spain, 1501-1621 |url=https://archive.org/details/goldencenturyofs0000rtre_a2p2/page/24/mode/1up?q=infantry |publisher=Macmillan and Co. Ltd. |location=London, UK |date=1937 |pages=123-124, 163-164169, 285 |oclc=1417557821 |lccn=84019806 |language=en |format=pdf |access-date=February 5, 2025 |url-access=registration }}
* {{cite book |last1=de Mesa |first=Eduardo, Gallego |title=The Irish in the Spanish Armies in the Seventeenth Century |date=2014 |publisher=Boydell & Brewer, Boydell Press |jstor=10.7722/j.ctt6wp8jf |isbn=978-1-84383-951-4 |url=https://www.jstor.org/stable/10.7722/j.ctt6wp8jf |access-date=21 March 2024 |language=En |url-access=subscription }}
* {{cite web |last=De Mesa Gallego |first=Eduardo  |title=La pacificación de Flandes. Spínola y las campañas de Frisia (1604-1609) [The Pacification of Flanders. Spinola and the Friesland Campaigns (1604-1609)] |website=Academia.edu |date=2009 |url=https://www.academia.edu/3006856/La_pacificaci%C3%B3n_de_Flandes_Sp%C3%ADnola_y_las_campa%C3%B1as_de_Frisia_1604_1609_The_Pacification_of_Flanders_Spinola_and_the_Friesland_Campaigns_1604_1609_ |language=es |access-date=1 March 2024 |url-access=subscription}}
* {{cite book |last1=Notario López |first1=Ignacio |last2=Notario Lopez |first2=Iván |last3=Embleton |first3=Gerry |last4=Embleton |first4=Sam |title=The Spanish Tercios, 1536-1704 |publisher=Osprey Publishing |location=Oxford, UK |date=2012 |isbn=978-1-78096-873-5 |oclc=829815325 |url=https://www.academia.edu/24746420 |url-access=subscription}}
*[http://forum.milua.org/archive/TactiqueUk.htm Spanish Tercio Tactics] {{Webarchive|url=https://web.archive.org/web/20110728003458/http://forum.milua.org/archive/TactiqueUk.htm |date=28 July 2011 }}
*[http://www.myarmoury.com/feature_armies_spanish.html Renaissance Armies: The Spanish] (myArmoury.com article)
*[http://ferrol.historia.tripod.com/ferrolnaval1525/ Spanish web site] – Honors Alonso ''[[Pita da Veiga]]'' the most heroic Spaniard at the [[Battle of Pavia]] (Italy) 1525.
*[http://www.revistanaval.com/infanteriademarina/]  Non-Official Web siteof the Modern "Spanish Marines" (in existence since 1537 few years after ''[[Battle of Pavia]]'' (Italy) 1525 and well before the ''[[Battle of Lepanto (1571)|Battle of Lepanto]]'' (Greece) 1571).
*[https://crossfireamersfoort.wordpress.com/2012/07/02/the-spanish-army-of-the-thirty-years-war/ The Spanish Army of the Thirty Years’ War]
*[https://crossfireamersfoort.wordpress.com/2012/07/02/list-of-tercios/ List of Tercios]
* Lorraine White – [https://doi.org/10.1191%2F0968344502wh248oa The Experience of Spain’s Early Modern Soldiers: Combat, Welfare and Violence ]
* Pierre de Bourdeille, ''Gentilezas y bravuconadas de los españoles'' (r/p Mosand, Madrid, 1996)
* Marcos de Isaba, ''Cuerpo enfermo de la milicia española'' Ministry of Defence, Madrid (Brussels, 1589)
* Sancho de Londoño, ''El discurso sobre la forma de reducir la disciplina militar a mejor y antiguo estado'' Ministry of Defence, Madrid (Brussels, 1589)
* Bernardino de Escalante, ''Diálogos del arte militar'' Ministry of Defence, Madrid (1583)
* Martín de Eguiluz, Milicia, ''Discurso y Regla militar'' Ministry of Defence, Madrid (pre-1591)
* Diego de Salazar, ''Tratado de Re Militari'' Ministry of Defence, Madrid(1590)
* Serafín María de Soto, ''Conde de Clonard, Album de la infantería española'' (1861)
* Rene Quatrefages, ''Los Tercios'' (Madrid, ediciones Ejército, 1983)
* Inspección de Infantería, ''La infantería en torno al siglo del oro'' (Madrid, ediciones Ejército, 1993)
* Julio Albi de la Cuesta, ''De Pavia a Rocroi: los Tercios de Infantería española en los siglos XVI y XVII'' (Madrid, Balkan, 1999)
* Enrique Martínez Ruiz, ''Los soldados del Rey'' (Madrid, Actas, 2008)
* Pierre Picouet, ''Les Tercios Espagnols 1600–1660'' (in French – Auzielle, LRT, 2010)
{{refend}}

{{Spanish Empire}}

[[Category:Infantry units and formations]]
[[Category:Military units and formations of the early modern period]]
[[Category:Military units and formations of Spain]]
[[Category:Military strategy]]
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[[Category:Spanish Empire]]
[[Category:House of Habsburg]]
[[Category:Military units and formations of the Italian Wars]]
[[Category:Spanish inventions]]