View source for Cromwell tank

{{Short description|British WWII cruiser tank}}
{{Use dmy dates|date=June 2017}}
{{Use British English|date=January 2019}}
{{Infobox weapon
|is_vehicle=yes
|is_UK=yes
|name= Tank, Cruiser, Mk VIII, Cromwell (A27M)
|image= File:Cromwell (A27M) front-right 2017 Bovington.jpg
|image_size = 300
|caption=A Cromwell IV at the [[Bovington Tank Museum]]
|type=[[Cruiser tank]]
|origin=United Kingdom
|used_by=[[British Army]], [[Israeli Army]], [[Greek Army]], [[Portuguese Army]]
|designer=[[Leyland Motors|Leyland]], then [[Birmingham Railway Carriage and Wagon Company]] from 1942<ref>WWII Vehicles</ref>
|design_date=
|manufacturer=[[London, Midland and Scottish Railway]], [[English Electric]], [[Leyland Motors]], [[Morris Motors]]
|service= 1944–1955
|wars=[[World War II]], [[1948 Arab–Israeli War]], [[Korean War]]
|production_date=
|unit_cost = £10,000<ref name="Hansard-10Mar52">{{citation |last1=Hughes|first1=Emrys|title=House of Commons Debates; Centurion Tank (Cost)|url=https://api.parliament.uk/historic-hansard/commons/1952/mar/10/centurion-tank-cost |work=[[Hansard|Parliamentary Debates (Hansard)]]|access-date=21 May 2016 |volume=497 |date=10 March 1952|at=c1000 |publisher=UK Parliament}}</ref>{{efn|It was stated in the House of Commons in 1952 that in 1945 a Cromwell tank cost £10,000.<ref name="Hansard-10Mar52"/>  This figure was a 1941 estimate of the basic price of a Cromwell tank,<ref name="Coombs (2015) p53">{{cite book |page=53 |title=British Tank Production and the War Economy, 1934–1945 |first1=Benjamin |last1=Coombs |year=2015 |isbn=978-1474227902 |publisher= Bloomsbury Academic}}</ref> a type of tank that went into production in January 1943.}}
|number=4,016
|crew=5 (Commander, gunner, loader/radio operator, driver, hull gunner)
|length= {{convert|20|ft|10|in|m|abbr=on}}<ref name= "Fletcher1983p7" />
|width= {{convert|9|ft|6+1/2|in|m|abbr=on}}<ref name= "Fletcher1983p7" />
|height= {{convert|8|ft|2|in|m|abbr=on}}<ref name= "Fletcher1983p7" />
|weight= {{convert|27.6|LT|MT|abbr=on}}
|armour= {{convert|64|mm|in|abbr=on}} on the hull front, {{convert|76.7|mm|in|abbr=on}} on the turret front{{sfnp|Fletcher|Harley|2006|p=12}}
|primary_armament= [[Ordnance QF 6-pounder]]<ref name= "Fletcher1983p7" /><br> with 75 rounds<ref name= "Fletcher1983p7" /><br> [[Ordnance QF 75 mm]]<br>with 64 rounds
|secondary_armament=2 × 7.92 mm [[Besa machine gun]]<br>with 4,950 rounds<ref name= "Fletcher1983p7" />
|engine=[[Rolls-Royce Meteor]] V12 [[petrol]]
|engine_power= {{convert|600|hp|kW|abbr=on}}
|suspension=Improved [[Christie suspension|Christie]]
|transmission=Merritt-[[David Brown Ltd.|Brown]] Z.5 gearbox (five forward and one reverse gear)
|speed={{ubl|{{convert|64|km/h|mph|abbr=on|order=flip}} maximum with 3.7:1 final reduction drive| {{convert|41|km/h|mph|abbr=on|order=flip}} on roads| {{convert|29|km/h|mph|abbr=on|order=flip}} cross-country}}<ref name="Higgins, p. 12">Higgins, p. 12</ref>
|fuel_capacity={{convert|116|impgal|L|abbr=on}} + optional {{convert|30|impgal|L|abbr=on}} auxiliary<ref name= "Fletcher1983p7" />
|pw_ratio=21.4 hp/tonne (16 kW/t)
|clearance={{convert|16|in|abbr=on}}<ref name= "Fletcher1983p7">Fletcher (1983), p7</ref>
|vehicle_range= {{convert|170|mi|km|abbr=on}} on roads, {{convert|80|mi|km|abbr=on}} cross country<ref>Cromwell Tank Vehicle History and Specification (Tank Museum) 1984 page 7.</ref>
}}

The '''Cromwell tank''', officially '''Tank, Cruiser, Mk VIII, Cromwell (A27M)''', was one of the series of [[cruiser tank]]s fielded by Britain in the [[Second World War]].{{efn|The eighth Cruiser tank design, its service name given for ease of reference and its General Staff specification number respectively.}} Named after the [[English Civil War]]–era military leader [[Oliver Cromwell]], the Cromwell was the first tank put into service by the British to combine high speed from a powerful, reliable engine (the [[Rolls-Royce Meteor]]) and reasonable [[vehicle armour|armour]]. The intended dual-purpose high-velocity gun could not be fitted in the turret, so a medium-velocity dual-purpose gun was fitted instead. Further development of the Cromwell combined with a high-velocity gun led to the [[Comet tank]].

The name "Cromwell" was initially applied to three vehicles during development. Early Cromwell development led to the creation of the [[A24 Cavalier]]. Later Cromwell development led to the creation of the competing [[Centaur tank]] (officially the ''Tank, Cruiser, Mk VIII, Centaur (A27L)''). This was closely related to the Cromwell, both vehicles being externally similar. The Cromwell and Centaur tanks differed in the engine used; the Centaur had the 410 [[Horsepower|hp]] [[Liberty engine]], the Cromwell had the significantly more powerful 600&nbsp;hp Meteor; Centaur hulls were converted to Cromwells by changing the engine.

The Cromwell first saw action in the [[Battle of Normandy]] in June 1944. The tank equipped the armoured reconnaissance regiments of the [[Royal Armoured Corps]], in the [[7th Armoured Division (United Kingdom)|7th Armoured Division]], [[11th Armoured Division]] and the [[Guards Armoured Division]]. While the armoured regiments of the latter two divisions were equipped with [[M4 Sherman]]s, the armoured regiments of the 7th Armoured Division were equipped with Cromwells. The Centaurs were not used in combat except for a few fitted with a 95&nbsp;mm howitzer, which were used in support of the [[Royal Marines]] during the amphibious landings of Normandy.

==Development==

===Initial designs: A23, A24===
{{See also|Cavalier tank#Development|l1=Cavalier tank development}}

Development of the Cromwell and Centaur dates to 1940, as the [[Crusader tank]] was being readied for service. The [[General Staff]] were aware that the Crusader would become obsolete, and in late 1940 they set out the specifications for a replacement tank, expected to enter service in 1942, fitted with the [[Ordnance QF 6 pounder|QF 6 pounder]] gun.

[[Vauxhall Motors|Vauxhall]] responded with the A23, a scaled down version of their [[Churchill tank|A22 Churchill]] infantry tank. This would have had 75&nbsp;mm of frontal armour, used a 12-cylinder Bedford engine, carried a crew of five and would have had the same suspension as the A22.

[[Nuffield Mechanisation and Aero|Nuffield]] submitted the A24, heavily based on its Crusader design and powered by its version of the [[Liberty L-12#Nuffield Liberty|Liberty engine]], a V-12 design dating to the late days of [[World War I]] and now thoroughly outdated. Nevertheless, as the design was based on the Crusader, it was expected it could be put into production rapidly.

The final entry was from [[Leyland Motors|Leyland]] and [[Birmingham Railway Carriage and Wagon Company|Birmingham Railway Carriage & Wagon]] (BRC&W). Their design{{efn|It is unclear if it was granted its own number or also referred to as the A24.}} was similar to the Nuffield, but with different suspension and tracks.<ref>Crawford, Steve. ''Tanks of World War II'', pg. 46</ref>

The designs were received and examined in January 1941, with Nuffield's A24 being declared the winner on 17 January. Six prototypes of the Cromwell were ordered for the spring of 1942. These arrived four months late, and by this time the design was already outdated. It was put into production anyway, but in service it proved underpowered. Only a small number were built.

Delays in the A24 program led to demands to get the QF 6 pounder into service earlier. This led to a series of up-gunned Crusaders mounting the 6 pounder.{{sfn|Fletcher, Great Tank Scandal|pages=65–66}}

===Introduction of Meteor engine===
{{Main|Rolls-Royce Meteor}}
With the start of the war, [[Rolls-Royce Limited|Rolls-Royce]] ended car production and set up a design team looking for other ways to use their design capability. The team formed under the direction of [[W. A. Robotham]] at Clan Foundry in [[Belper]], north of [[Derby]]. They began recovering and refurbishing parts from crashed Merlin engines with the intention of using them for non-aviation purposes.

In October 1940, Robotham met Henry Spurrier of Leyland Motors to discuss British tank design. The Tank Board desperately needed a more powerful tank engine to replace the aging Liberty. Robotham and Spurrier decided to attempt to fit a refurbished and re-worked [[Rolls-Royce Merlin]] engine to a Leyland tank for testing. Design had three priorities:<ref name="ReferenceD">Silver Ghosts and Silver Dawn; W A Robotham; Constable, London</ref>
* To remove the supercharger and make the engine operate on standard fuel;
* To fit the engine into a current [[Crusader tank]] so the engine, and the remaining elements of the tank could be tested under greater load;
* To improve the cooling system such that the larger output engine could be cooled in the same space.

They removed the supercharger from a Merlin Mk. III to downgrade the performance to a suitable level for tank use, reversed the direction of engine rotation to match tank transmissions, and fitted the resulting engine to a Leyland-built Crusader.

Delivered to [[Aldershot]] on 6 April 1941, the test team had trouble timing its runs because it was so fast, estimating it reached {{convert|50|mph}}. Leyland arranged to start production of 1,000 examples of the engine as the Meteor.

With engine power doubled, it soon became apparent that the additional stresses placed on the Crusader components required significant re-work to increase reliability.<ref name="ReferenceD"/> Leyland had no spare capacity, and re-work commenced with the help of BRC&W.<ref name="ReferenceD"/> It was planned to fit this to BRC&W-built versions of their original A24 submission.

===Design splits, and production commences: A24, A27L, A27M===
Refitting the design of the A24 Cromwell for the Meteor engine was not acceptable to Nuffield, and hence a new specification of tank was created working with Leyland, the ''A27'' Cromwell.

In mid-1941, Leyland changed its mind, concerned about cooling problems. This was a major concern for the Tank Board, as cooling issues had been a major problem for the previous generation of Crusader and Covenanter tanks. The Tank board was still committed to the Meteor, but to avoid dedicating all resources into a potentially flawed design, the design was split into three separate vehicles:
* ''A24 Cromwell I'' under Nuffield, later known as "Cavalier". This was based on the existing specification of Liberty engine and Wilson steering, working from experience learned with the Crusader.
* ''A27L Cromwell II'' initially under [[English Electric]], but design taken over by Leyland, later known as "Centaur". This was to be based on a revised and upgraded Liberty engine from Morris Motors and the newly available Merrit-Brown gearbox as used on the Churchill tank.<ref name="AFVProfile">Bingham (1971)</ref>
* ''A27M Cromwell III'' under BRC&W, which carried the Cromwell name through to production and service. This was to be based on the new Meteor engine and the Merrit-Brown gearbox, but was also to be designed such that the Liberty engine could be fitted if problems arose.

These early design designations of Cromwell I, II, and III are not to be confused with the later production designations of Cromwell I, II, etc. which were production variants of the A27M.

While Leyland continued with the Liberty under A27L, the Tank Board continued with the Meteor engine by placing an order directly with Rolls-Royce. Leyland also suggested using a diesel engine of their own design, although this was later abandoned. BRC&W became parent to the Cromwell in September 1941 working with David-Brown (gearbox) RR (engine) and  Leyland (tracks and sprockets) and produced a pilot in January 1942.<ref name="AFVProfile" />

Cromwell's cooling system was a new design and put through over nine months of testing in a variety of configurations. This included the development of new fan drives and inlet louvres, which can be seen on the Cromwell's engine deck. The resulting system for a Meteor-powered tank delivered both the necessary cooling performance, and reduced the power lost in driving the cooling system from 90 to 30&nbsp;hp.<ref name="ReferenceA">Development of Cromwell Series, FVDE</ref> ‘To Fred Hardy, the chief development engineer at Rolls Royce Belper, must go the credit for originating the design which finally solved the (cooling) problems. It was an outstanding piece of engineering’.<ref name="ReferenceD"/> This made the performance improvement of the Meteor over the Liberty even more pronounced and left room for expected development of the A27.

The first (mild steel) prototype of a Meteor-powered A27M Cromwell was delivered to the Army for trials in March 1942,{{sfnp|Chamberlain|Ellis|1981|p=43}} several months before the A24 that was supposed to precede it, and also prior to the A27L Centaur pilot vehicle which was delivered in June 1942.<ref name="AFVProfile" /> With nearly {{convert|600|hp|kW|abbr=on}} it proved to be exceptionally mobile when tested.

Orders were placed for both A27L and A27M versions as there were concerns about the production rate of the Meteor. Design also commenced on a 17-pounder armed version under specification A30, leading to parallel development of the [[Cruiser Mk VIII Challenger|A30 Challenger]].

As all of Rolls-Royce's production capacity was engaged in producing the Merlin engine for aircraft, production of the Meteor version was initially based solely on parts recovered from crashed aircraft, with many engines still showing crash damage. Additional sources for manufacturing the Meteor engine were investigated. Even when assigned reduced production quotas, BRC&W proved unable to meet the demand for Cromwell, and Leyland became the design and production parent of both the A27L and A27M versions including subcontracted work.{{sfnp|Chamberlain|Ellis|1981|p=43}}

===Engine production===
Rolls was at this time having trouble meeting demand for the Merlin, let alone the Meteor. [[Rover Company|Rover]] was having trouble turning [[Frank Whittle]]'s [[Power Jets W.2]] jet engine design into a production engine due to increasing animosity between the engineers at [[Power Jets]] and Rover. Things became particularly heated when Whittle learned that Rover had set up a secret project (with the approval of the [[Ministry of Aircraft Production]]) to develop a simpler-to-produce "straight-through" version of the W.2. Whittle had, though [[Stanley Hooker]] of RR's supercharger division, been in contact with Rolls for help delivering some of the required parts that Rover proved unable to produce.

At the same time MAP was frustrated with Power Jets' complaints about Rover and the lack of a usable engine and had proposed in December 1942 that RR take over Power Jets but were not in a position to force such an event.<ref name="Nahum">{{cite book |last=Nahum |first=Andrew |title=Frank Whittle: Invention of the Jet |publisher=Icon Books Ltd |year=2004 |isbn=1840465387 |pages=88–93}}</ref> The solution came in an agreement between Rover and RR. [[Ernest Hives]], the head of Rolls  had met Whittle and was fascinated by the jet engine (Rolls-Royce's main product was piston aero engines) called a meeting with his counterpart at Rover, [[Spencer Wilks]], and the two met late in 1942 at the [[Swan Court Shopping Arcade|Swan and Royal pub]] in [[Clitheroe]]. Hives offered to trade the Meteor for the W.2, an offer Wilks jumped at. With approval by the company's boards and the MAP, Rover's jet engine team and production transferred to RR while Rover set up production of the Meteor engine at their Tyseley factory and at an additional line set up by [[Morris Motors]] in Coventry.<ref name="Nahum" />{{efn|Under Rolls Royce, both Whittle's and Rover's designs came to fruition as the Welland and Derwent engines respectively with the Derwent becoming the main production.}}

Production began in November 1942. In August, new names had been given to all three designs; the original A24 Cromwell I became the [[Cavalier tank|Cavalier]], the Liberty powered A27L Cromwell II became Centaur and the Meteor powered A27M kept the name Cromwell.<ref>Fletcher (1983) p.xi</ref> It would take considerable time for Rover to make ready production lines for the Meteor and it was not until January 1943, that sufficient Meteor engines were available and the A27M Cromwell began production. The official handover of the Meteor and W.2 took place on 1 January 1943.

===Armament choice===
To increase production of Meteor engines Rover and Morris required machine tools from the US, that took time to deliver. In the interim, Centaur production continued, to avoid closing Cromwell tank production lines. The Cromwell had - in line with the then General Staff policy - originally be armed primarily for anti-tank work and the current  [[Ordnance QF 6-pounder|QF 6-pounder]] (a high velocity tank gun with [[Armour-piercing ammunition|armour piercing (AP) ammunition]] met the requirement.<ref name="AFVProfile" /> A smaller number of tanks were to have the [[Ordnance QF 95 mm howitzer]] to fire high explosive and smoke shells as close support tanks.

The British experience in North Africa campaign was that during breakthroughs of the enemy line, tanks were encountered less often but anti-tank guns and infantry were the main targets. The US-supplied M3 Grant and [[M4 Sherman]] tanks in North Africa had a dual purpose [[75 mm Gun M2/M3/M6|75 mm gun]] which fired a more effective HE shell than the 6-pounder at the cost of a reduction in armour-piercing performance and this was seen as desirable for British tanks. Once the Vickers 75&nbsp;mm HV gun was seen to be too big for the Cromwell turret, work was begun in December 1942 on the [[Ordnance QF 75 mm]] (a development of the 6-pounder that fired US ammunition) for fitting to British tanks. The new General Staff policy was announced at start of 1943; British medium tanks would be equipped with dual-purpose guns that were effective against current German tanks and they would be supported by tanks with high power anti-tank guns and close support weapons.<ref name="AFVProfile" />  Mark IV Cromwells were delivered with 75&nbsp;mm guns from October 1943.<ref name="AFVProfile" />{{efn|Churchill tanks were fitted with 75 mm from new or converted from the 6-pounder from November too.}}

To maintain the capability to take on Axis tanks, production was to be split
* 10 per cent fitted with [[Ordnance QF 95 mm howitzer]]
* 30 per cent with a high velocity weapon, either the [[Ordnance QF 6-pounder|6-pounder]] or under the [[Cruiser Mk VIII Challenger|A30 development]] the 76&nbsp;mm [[17-pounder]]
* 60 per cent with a "dual purpose weapon"

Noting the problems with the medium velocity 75&nbsp;mm dual purpose weapon, Vickers had already commenced development of a high velocity 75&nbsp;mm gun that would fire American 75&nbsp;mm ammunition but at a much higher velocity.

A move to Sherman tanks was not acceptable to British forces who would then be dependent on the US for tank production.{{dubious|date=April 2017}} The Cromwell with the Meteor engine and a HV weapon was shown to have superior power and armament, while US efforts to produce the Sherman replacement, the [[T20 medium tank]], were not receiving sufficient attention.{{citation needed|date=September 2023}}

A compromise was achieved with a reduction in British tank production during 1943 and 1944, with an increase in the use of Sherman tanks, the remainder being delivered in parts as spares. Centaur production bore the brunt of this reduction, having only been continued to maintain factories producing Cromwell hulls while the number of Meteor engines was inadequate. It had already been arranged that Centaur production would end when Meteor engine production increased. The list of machine tools required for the increase in Meteor output was also agreed upon, allowing Cromwell manufacture to scale.

At the same time as negotiations with the US, problems were being encountered with the use of the Vickers 75&nbsp;mm HV gun in the Cromwell, with a larger turret ring being required. This was now expected to be introduced in mid-1944, leaving the majority of Cromwells with the medium velocity guns similar to the Shermans. Design of the high velocity variant was split to a separate specification. Intended as just another version of Cromwell, the new ''A34'' version eventually needed significant re-engineering leading to production of the [[Comet tank|A34 Comet]], which used a high velocity gun firing 17-pounder projectiles with a smaller cartridge down a shorter barrel. In the interim, the A27M version started.

===Early trials===
The first real field test of the design was carried out in August–September 1943, when examples of the Centaur and Cromwell were tested against Shermans (the diesel-engined M4A2{{efn|in British service known as "Sherman III"}} and multibank petrol-engined M4A4{{efn|in British service known as the "Sherman V"}}) in Exercise Dracula, a {{convert|2000|mi|km|abbr=on}} long trip around Britain. The Shermans proved to be the most reliable by far, requiring 420 hours of specialist fitter attention over a total distance travelled of {{convert|13986|mi|km|abbr=on}} with 199 defects. This corresponds to 0.03 hours per mile. In comparison, the Cromwells drove {{convert|11582|mi|km|abbr=on}} with 367 defects and required 814 hours, or 0.07 hours per mile. The Centaur managed only {{convert|8492|mi|km|abbr=on}} with 297 defects, due to constant breakdown, and required 742 hours, or 0.087 hours per mile.<ref name=test>{{cite web |url=http://worldoftanks.com/en/news/pc-browser/21/The_Chieftains_Hatch_Dracula/?page=1 |title=The Chieftain's Hatch: Exercise Dracula |date=5 July 2014|author=Nick Moran |publisher=Wargaming.net}}</ref>

The Cromwell and Centaur were given additional time to work out these problems. The Cromwell problems were mostly related to oil leaks and brake and clutch failures, an observer noting that these were well-known and should already have been corrected. The crews expressed their love for the design and especially its speed and handling. The Centaur was largely dismissed, with one observer expressing his hope that units were being equipped with it only for training purposes. The same reviewers unanimously supported the Sherman.<ref name=test/> A similar test in November demonstrated the Cromwell was improving, while the underpowered Centaur fared no better than in the first test.

Alongside Cromwell production, Centaur production design also allowed for the later conversion to the Meteor engine. A small number were retro-fitted for trials as Cromwell III and Cromwell X. As the Cromwell proved itself, larger numbers were fitted with the Meteor engine on the production line as Cromwell III and IV (not to be confused with the earlier Cromwell III design project).{{sfnp|Fletcher|Harley|2006|p=}}{{page needed|date=January 2021}}

===Final specification===
The production model design was finalised on 2 February 1944 when Leyland released specifications for what they called the "Battle Cromwell".

This included a number of minor changes to the basic design, including {{convert|6|mm|abbr=on}} of extra armour below the crew compartment, the introduction of an all-round vision cupola for the commander, [[seam welding]] all joints to waterproof and strengthen the tank, and standardising on the A27M version with Meteor engine and Merritt-Brown transmission.

The Cromwell Final Specification was applied part way through the production of Cromwell III and IV, changing the appearance and specification of both vehicles. The specification was later improved toward the end of the war with the Cromwell VII, resulting in an upgrade programme.

Centaur and Cavalier never met the requirements to enter front-line service. Most were used for training, although a few notable exceptions were used in action. {{citation needed|date=January 2021}}

==Production==
{{See also|British armoured fighting vehicle production during World War II}}

Total A27 production consisted of 4,016 tanks, 950 of which were Centaurs and 3,066 Cromwells; another 375 Centaur hulls were built for an anti-aircraft gun turret; only 95 of these were completed. Production was led by [[Leyland Motors]] on Centaur, and [[Birmingham Railway Carriage and Wagon Company]] (BRC&W) on Cromwell. Several other British firms built Centaur and Cromwell tanks, as the numbers required were greater than any one company could deliver. Companies contracted to build the tanks included [[English Electric]], [[Harland and Wolff]], [[John Fowler & Co.]], [[London, Midland and Scottish Railway#Construction|LMS Railway]], [[Metro-Cammell]], [[Morris Motors]] and [[Ruston-Bucyrus]].<ref name="Shermanic">{{cite web |url=http://freespace.virgin.net/shermanic.firefly/a27m.html |title=The A27M Cromwell tank |access-date=8 March 2004 |archive-date=4 February 2012 |archive-url=https://web.archive.org/web/20120204034207/http://freespace.virgin.net/shermanic.firefly/a27m.html |url-status=dead }}</ref>

Production of Cromwell and Centaur was split into two groups.{{sfnp|Fletcher|Harley|2006}}{{page needed|date=August 2022}} The Cromwell was to be built by BRC&W and Metro-Cammell while Centaurs were to be built by Leyland, English-Electric, Harland & Wolf, John Fowler & Co., LMS, Morris, Ruston-Bucyrus. Nuffield also switched production to the Centaur when the Cavalier order was completed. To increase Cromwell production capacity, English Electric switched from manufacturing the Centaur to the Cromwell but remained tooled for the Centaur. This resulted in a number of Cromwells being built with Centaur hulls. By January 1943, when production started, Leyland had become the production and design lead for A27 series including subcontractors producing components.{{sfnp|Chamberlain|Ellis|1981|p=43}} Records show that John Fowler & Co. also produced both varieties. Vauxhall produced two Cromwell pilot models—with a turret similar to that of the [[Churchill tank|Churchill]]—in the expectation that they would build Cromwells once production of Churchill was terminated in 1943 but Churchill production was extended and Vauxhall withdrew from the Cromwell programme.{{sfnp|Chamberlain|Ellis|1981|p=45}}

==Design==

===Hull===
[[File:Sherman and cromwell silhouette.png|thumb|Silhouettes of [[M4 Sherman]] (top) and Cromwell (bottom) together]]
The frame was of riveted construction and welding was used later. The armour plate was bolted to the frame; large bosses on the outside of the plate were used on the turret. The suspension was of the [[Christie suspension|Christie type]], with long helical springs (in tension) angled back to keep the hull sides low. Of the five road wheels on each side, four had shock absorbers. The tracks were driven by [[sprocket|sprocketed wheels]] at the rear and tension adjusted at the front idler, this being standard British practice. Some variants were produced with {{convert|14|in|mm|adj=mid|-wide}} tracks; later, 15.5-inch tracks were used. As with previous Christie-suspension cruiser tanks, there were no track return rollers, the track being supported instead on the tops of the road wheels, known as the "slack-track" design. The side of the hull was made up of two spaced plates, the suspension units between them, and the outer plate having cutouts for the movement of the road-wheel axles.

The gearbox had five forward and one reverse gears. The first gear was for "confined spaces, on steep inclines or...sharp turns".<ref>Fletcher (1983) p13</ref> The transmission was the new Merrit-Brown Z.5, which offered differential steering without clutching or braking, a big advance in design. It gave the Cromwell superb manoeuvrability. The Meteor engine delivered {{cvt|540|hp}} at 2,250 rpm{{citation needed|reason=No source provided for figure of 540bhp which seems to disagree with other figures stating 600bhp and Meteor page says 550 is bottom of range|date=January 2025}}  giving the Cromwell speed as well as manoeuvrability. This was the maximum rpm, which was limited by governors built into the magnetos. Fuel consumption on "pool" petrol (67 [[octane rating|octane]]) was between 0.5 and 1.5 miles per gallon depending on terrain.

[[File:Winston Churchill during the Second World War H37169.jpg|thumb|Churchill inspecting a Cromwell. The driver can be seen looking through the port to the left, with periscopes above him.]]
The driver sat on the right in the front of the hull, with the hull gunner on the left, separated by a bulkhead. The driver had two periscopes and a visor in the hull front.<ref name=":3">Fletcher (1983) p16</ref> The visor could be opened fully or a small "gate" in it opened; in the latter case, a thick glass block protected the driver. The gunner had a single sighting periscope.<ref name=":3" /> A bulkhead with access holes separated the driver and hull gunner from the fighting compartment. A bulkhead separated the fighting compartment from the engine and transmission bay. The engine compartment drew cooling air in through the top of each side and the roof and exhausted it to the rear. To allow fording through up to {{cvt|4|ft|abbr=on}} deep water, a flap could be moved to cover the lowermost air outlet.<ref>User Manual</ref>{{page needed|date=May 2024}} Air for the engine could be drawn from the fighting compartment or the exterior; it was then passed through oil bath cleaners. It was modified so that the exhaust fumes were redirected so that they were not drawn into the fighting compartment, a problem found when tanks were drawn up together, preparing to advance.<ref>Fletcher, p. 100</ref>

In June 1944, the Cromwell saw action during [[Operation Overlord]], the [[Allies of World War II|Allied]] invasion of Normandy. It had a mixed reception by crews, being faster, and with a lower profile than the [[Sherman tank]] but also being smaller and more cramped. The Cromwell had {{cvt|64|mm|abbr=on}} of frontal armour, compared with {{cvt|2|in|order=flip|abbr=on}} on the glacis of the early Shermans, though it was unsloped and hence less effective in practice.<ref name="Higgins, p. 12">Higgins, p. 12</ref> 123 Cromwells were later produced with applique armour on the hull front that reached {{cvt|101|mm|in|abbr=on}}.{{sfn|Fletcher|Harley|2006|p=18}}

===Turret and armament===
Following British tank doctrine, the vehicle was designed to fire on the move. The turret offered hydraulically powered turret traverse motors with proportional speed control. Later vehicles fitted an all-round view cupola for the commander to identify and track targets. Both gunner and commander had rotating and pivoting [[Vickers Tank Periscope MK.IV|Vickers Gundlach tank periscopes]], while two fixed episcopes were fitted in the rotating cupola.<ref>Fletcher (1983) p56</ref> There was a 7.92&nbsp;mm [[Besa machine gun]] mounted co-axially to the main armament, operated by the gunner. A second was gimbal mounted in the front of the hull, with 45 degrees horizontal and 25 degrees vertical movement. Sighting was by a No. 35 telescope, which was connected through a linkage to the mounting. In the top of the turret was a 2-inch "bombthrower" angled to fire forward. Thirty [[smoke grenade]]s were carried for it.

Early models of the Cromwell were equipped with the [[Ordnance QF 6 pounder|QF 6-pounder]] (57&nbsp;mm). Using the new [[armour-piercing discarding sabot]] round, which became available in quantity in early 1944, this gun could penetrate over {{cvt|100|mm}} of steel armour at ranges on the order of {{cvt|1000|yd}}, making it effective against all but the most heavily armoured tanks. British tank crews had long complained about this weapon's lack of a useful [[high explosive]] (HE) round for attacking soft targets like trucks, anti-tank guns and infantry defences. A HE shell had been introduced for the 6-pounder, but it was described as being largely useless—the calibre of the gun was simply too small to carry a useful load of explosive. This was not entirely accidental; British tank policy of the time suggested that different models of the same tank, carrying specialist weapons, was a better solution to this problem than a universal gun that attempted to do all things.

Experience with the US [[75 mm Gun (US)#M3 /L40|M3 75 mm gun]] suggested this thinking was wrong, that a gun could be used in a "dual purpose" role against both tanks and softer targets. This led Vickers to begin development of a 75&nbsp;mm weapon of 50 calibres in length, which would fire the same HE shell as the US gun, but with a higher propellant load that would make its anti-tank rounds more effective. As examples of this weapon began to arrive in May 1943, it was clear it would not fit into any turret that could be mated to the Cromwell's turret ring. The problem was eventually solved by the realisation that the 6-pounder could be bored out to 75&nbsp;mm and fire unmodified US ammunition. While this would lead to poorer anti-tank performance, this was considered a reasonable trade-off in exchange for the rapid introduction of the HE rounds. The [[Ordnance QF 75 mm|ROQF 75 mm]] could be easily swapped with the 6-pounder, and new models mounting the gun were known as the Mark V. The ROQF 75&nbsp;mm would be the primary weapon for the majority of Cromwells produced. A close support version of the Cromwell was fitted with the [[Ordnance QF 95mm Howitzer|QF 95 mm howitzer]] in place of the 75&nbsp;mm. This too fired HE, though its primary role was delivering smoke shells, covering the other tanks in the unit. Some command or OP tanks had the armament removed, leaving space in the turret for further radios. These were fitted with a dummy wooden gun, so as not to appear different to the enemy and attract hostile fire.

===Cromwell and Centaur differences===
Aside from the engine and its ancillaries (fans, radiator, clutch, etc.) the vehicles are very similar designs. While similar, there were a number of minor variations between the Cromwell and Centaur caused by the divergence of design and production. Increases in the Cromwell's design weight from {{cvt|24|to|27|LT}} resulted in a reworking of the suspension during the design process, which was not reflected on the Centaur.<ref name="ReferenceA"/> The Cromwell had heavier grade suspension with longer suspension arms. The Cromwell's shock absorbers and springs were improved against the Cavalier, and increased to four (compared with the Centaur's three).

The method of track tensioning is a commonly noted difference. Initially, the design based on the A24 Cavalier used a worm drive for tensioning. This was noted to be slow to operate and trapped dirt. BRC&W developed an alternative ratchet mechanism based on the [[Valentine tank]], and this was incorporated into the A27M Cromwell design, also enabling the tank to accept wider {{cvt|15.5|in|mm|abbr=on}} tracks.<ref>Development of the Cromwell series, FVDE</ref> Centaur under Leyland continued without this development. Some of these differences can be seen in Cromwells built with Centaur hulls, although many were removed with the introduction of the Cromwell Final Specification. This included the Cromwell method of track tensioning.{{sfnp|Fletcher|Harley|2006}}

The Cavalier can easily be identified by the vehicle's rear armour plate, which incorporates Crusader-style horizontal angled exhaust louvres.<ref>Illustrated Parts List Cavalier 1; Chillwell Cat. No. 62/346</ref> The Cromwell and Centaur both have a flat rear armour plate, with exhaust venting to the top immediately behind the engine deck. For this reason, many Cromwell and Centaur vehicles had a cowl fitted to direct the exhaust gases back where they could not re-enter the tank fighting compartment.

===Further developments===
An earlier requirement for a 17-pounder armed tank became more important when the 50 calibre Vickers 75&nbsp;mm HV gun failed to fit in the Cromwell. A version of the Cromwell mounting the more powerful [[Ordnance QF 17-pounder]] (76.2&nbsp;mm) had been commenced by BRC&W early in the development process. This required a much larger turret ring, which in turn required the hull to be lengthened (with an additional road wheel added to each side for a total of six) and the centre hull section widened. The result was the A30 [[Cruiser Mk VIII Challenger]], but had its limitations and only 200 were produced.{{sfn|Chamberlain|Ellis|1981|p=46}}{{efn|The turret armour thickness was reduced to reduce weight and improve performance}} While successful, production ceased in favour of the much easier conversion of [[Sherman Firefly]]s, originally developed as a safeguard for the A30 programme,{{sfn|Chamberlain|Ellis|1981|p=46}} allowing greater numbers to be fielded.

Development of the Vickers HV 50 calibre 75&nbsp;mm gun continued, with the bore increasing to fire modified versions of the 17-pounder ammunition. This gun and its ammunition were designed to fit in a turret that a reworked Cromwell-sized design could carry. This became the [[Ordnance QF 17-pounder#77 mm HV|77 mm HV]] with only slightly lower performance than the 17-pounder. By the time this weapon was ready, a number of other changes had been worked into the tank design, producing the [[Comet (tank)|Comet]], which replaced the Cromwell and Challenger.

==Performance==
[[File:The British Army in North-west Europe 1944-45 B14938.jpg|thumb|A [[15th/19th The King's Royal Hussars|King's Royal Hussars]] Cromwell of the [[11th Armoured Division]] advances through [[Uedem]], Germany, 28 February 1945]]
The A24 design specification had originally been constrained by the available tank engines of the time, delivering only 300&nbsp;hp and limiting the weight. The evolution to A27M increased the weight slightly, but fitting a 600&nbsp;hp engine almost doubled the power-to-weight ratio and created a very fast tank. This was combined with the Merrit-Brown gearbox that allowed the tank to steer while still powering both tracks, allowing it to maintain speed while manoeuvring, while tanks like the Sherman or T-34 lost power while turning and necessarily slowed down.

The Cromwell was the fastest British tank to serve in the Second World War, with a top speed of {{convert|40|mph|km/h|abbr=on}}.<ref>{{cite book|last1=Doherty|first1=Richard|title=British Armoured Divisions and their Commanders, 1939-1945|date=2013|publisher=Pen & Sword|location=Barnsley|isbn=978-1-84884-838-2|page=143|edition=First}}<!--|access-date=30 May 2016--></ref> This speed was extremely beneficial in both attack and defence, outmanoeuvring opponents. At least one case is known of vehicle commanders using the vehicle's fast speed to jump large gaps. In the Netherlands, a troop of three Cromwells was able to leap a {{convert|20|ft|m|abbr=on}} wide canal when surprised by enemy forces.<ref>Bellamy, Bill ''Troop Leader: A tank commander's story''; The History Press; {{ISBN|978-0750945349}}{{page needed|date=November 2020}}</ref> This speed proved too much for even the [[Christie suspension]] and in later models the final drive ratio was changed to lower the top speed to {{convert|32|mph|km/h|abbr=on}}, which was still fast for its time.<ref>''Workshop Manual for the Cromwell IV -VII''; Chief Inspector of Fighting Vehicles; July 1948</ref>{{page needed|date=September 2021}}

The Cromwell's armament was changed from the 6-pounder to the dual-purpose 75&nbsp;mm. This gave a significant reduction in armour penetration compared to newer 6-pounder [[armour-piercing discarding sabot]] ammunition, which was becoming available, but added the ability to fire high explosive (HE) shells, which were more capable against other targets, such as [[anti-tank gun]]s. The high velocity 75&nbsp;mm gun was developed in an attempt to give both good anti-tank and HE performance, but in May 1943 proved too big to be fitted to the Cromwell. This issue led to the development of the [[Comet tank|A34 Comet]], while the gun bore was increased to 76.2&nbsp;mm to become compatible with 17-pounder ammunition, albeit with smaller shell casings with less propellant. The lack of a high-velocity weapon proved to be a significant limitation against opponents such as the [[Tiger I|Tiger]], and the Cromwell had to rely on mobility.{{citation needed|date=September 2021}}

[[File:Polish 10th Mounted Rifle Regiment (Armoured Reconnaissance) in Cromwell Tank April 1945 2155 001777.jpg|thumb|left|Track links and sections are used as additional armour on this vehicle belonging to the Polish 10th Mounted Rifle Regiment in 1945]]
The dual-purpose 75&nbsp;mm main gun fired the same ammunition as the US 75&nbsp;mm gun as used on the Sherman, and was also fitted to the Churchill and other British tanks later in the war, it had around the same HE and armour-piercing capabilities as the 75&nbsp;mm-equipped Sherman tank. The Cromwell's speed and low profile gave an advantage over the Sherman, however, giving the tank the element of surprise and making return fire more difficult. Cromwell crews in north-west Europe succeeded in outflanking the heavier and more sluggish German tanks with superior speed, manoeuvrability and reliability.{{Citation needed|reason=please see talk page Re Doctrine|date=February 2018}}

The armour on the Cromwell ranged from {{convert|8|mm|abbr=on}} to {{convert|76|mm|abbr=on}} thick overall. On all-welded vehicles built by BRC&W, the weight saved by the welding allowed for the fitting of additional [[appliqué armour]] plates on the nose, vertical driver's plate and turret front, increasing the maximum thickness there to {{convert|102|mm|abbr=on}}. These vehicles are identified by their War Department numbers carrying the suffix W, e.g. T121710W. The armour compared well with that of the Sherman, although the Cromwell did not share the Sherman's sloped [[glacis plate]]. While the Cromwell was a match for the majority of Axis tanks in use, it was not a match for the armour and armament of the latest German heavy vehicles developed at the same time.{{citation needed|date=September 2021}} British tank design would go through another stage, the [[Comet tank|Comet]] cruiser, before developing the [[Centurion tank]].

==Combat service==

===World War II===
[[File:The British Army in North-west Europe 1944-45 BU549.jpg|thumb|Wounded German soldiers being ferried to an aid post on the hull of a Cromwell tank]]
[[File:The British Army in the Normandy Campaign 1944 B9329.jpg|thumb|Cromwell tanks of [[2nd Northamptonshire Yeomanry]], 11th Armoured Division, passing through [[Flers, Orne|Flers]], 17 August 1944]]
The Cromwell tank entered front-line service with the [[Allied invasion of Normandy]] in June 1944. Cromwells landed with the following forces on D+1. They saw extensive action with the British Army, forming part of the [[6th Airborne Division]], [[7th Armoured Division (United Kingdom)|7th Armoured Division]], [[11th Armoured Division]], [[Guards Armoured Division]], and [[1st Armoured Division (Poland)|1st (Polish) Armoured Division]]. The tank was also used by the 1st (Czechoslovakian) Independent Armoured Brigade Group as part of the First Canadian Army in Dunkirk.{{sfnp|Fletcher|Harley|2006}}

Cromwells were used as the main tank in the armoured brigades of the 7th Armoured Division, while being used in the armoured reconnaissance regiments of the other British armoured divisions, Guards Armoured Division and 11th Armoured Division, in north-west Europe. It excelled at this task because of its speed and low profile.{{sfnp|Bingham|1971|p=28}} The tank was praised for its speed and reliability, while its low profile made it harder to spot.

The standard 75&nbsp;mm gun could tackle the majority of German armoured vehicles, and the HE shell was effective, but could not penetrate the front of heavier German tanks such as the [[Tiger I|Tiger]] or [[Panther tank|Panther]]. Although a rare occurrence on the battlefield, during the Battle of Normandy it was in the British sector where the majority of these German machines were encountered. The issue with the 75&nbsp;mm gun was perhaps most pronounced during the [[Battle of Villers-Bocage]] in which the Cromwells were unable to engage German Tiger tanks frontally with any reasonable chance of success.<ref>{{cite book | last = Beevor | first = Antony | author-link = Antony Beevor | title = D-Day: The Battle for Normandy | publisher = Viking | date = 2009 | location = London | page = 195 | isbn = 978-0-670-88703-3 }}</ref> Several Tigers were knocked out by British forces in the battle nonetheless.

The 75&nbsp;mm HV had been intended to rectify this, but prior to entering service it was found to be too large to fit in the Cromwell's turret.{{sfnp|Fletcher|Harley|2006}}  Instead, Cromwells fought alongside the 17-pounder-armed [[Sherman Firefly]]s or [[Cruiser Mk VIII Challenger|Challengers]], both of which could destroy Panthers and Tigers at standard combat distances. Cromwells (and 75&nbsp;mm-armed Shermans) were supplemented by these vehicles at varying ratios per troop of 1/2 to 1/3. Though this provided a good solution to the issue of heavy German tanks, it added an additional level of complexity for battlefield commanders in having to place the 17-pounder tanks tactically within a formation. However this complication was not unique to the British Army; the US employed similar methods and faced the same issue with their 75&nbsp;mm Sherman tanks.

This situation persisted until the development of the A34 Comet, mounting the new 77&nbsp;mm HV gun, removed the need for mixed units.{{sfnp|Fletcher|Harley|2006}}

In contrast, the Centaur was chiefly used for training; only those in specialist roles saw action. The Centaur IV close support version, equipped with a 95&nbsp;mm howitzer, saw service in small numbers as part of the [[Royal Marine Armoured Support Group]] on [[D-Day]]. Originally intended to be used from landing craft{{sfnp|Bingham|1971|p=28}} and serve as static pillboxes, these examples retained the engines, allowing the marines to drive the tanks inland.{{sfnp|Fletcher|Harley|2006}} A number of Centaurs were also re-purposed as combat engineering vehicles, such as<!-- "as as" is correct !--> armoured bulldozers.

The Sherman remained the most common tank in British and other Commonwealth armoured units in Europe. The Cromwell, in turn, was succeeded by small numbers of the Comet tank. This was based on the Cromwell and shared many components but had been designed from the outset to mount a superior gun, the 77&nbsp;mm tank gun (a version of the 17-pounder with different ammunition).{{sfnp|Bingham|1971|p=34–35}} Only the 11th Armoured Division was fully re-equipped with the Comet before the war ended.

=== Units equipped ===
* 2nd Battalion [[Welsh Guards]]<ref name=":0">Bingham (1971) p12<!-- counting from cover as first page --></ref>
* [[8th King's Royal Irish Hussars]]<ref name=":0" />
* [[1st Royal Tank Regiment]]<ref name=":0" />
* [[5th Royal Tank Regiment]]<ref name=":0" />
* [[4th County of London Yeomanry (Sharpshooters)]] (to July 1944)<ref name=":0" />
* [[5th Royal Inniskilling Dragoon Guards]]<ref name=":0" />
* [[Northamptonshire Yeomanry|2nd Northamptonshire Yeomanry]] (to August 1944)<ref name=":0" />
* [[15th/19th The King's Royal Hussars|15th/19th King's Royal Hussars]] (from August 1944)<ref name=":0" />
* [[6th Airborne Reconnaissance Regiment|6th Airborne Reconnaissance Regiment, RAC]], within 6th Airborne Division<ref name=":0" />
* [[16th Independent Armoured Brigade]] (Polish){{Citation needed|date=May 2024}}
* [[10th Mounted Rifle Regiment]] (Polish)<ref name=":0" />
* [[Royal Marines Armoured Support Group]] (Centaur IV)<ref name=":0" />

===Post-war===
During the [[Korean War]], the British had a total of 14 Cromwell tanks: six of the [[8th King's Royal Irish Hussars]] Regiment and eight of the 45th Field Regiment, Royal Artillery. The Royal Artillery Cromwells were artillery observation tanks, lacking the main gun, but with expanded observation and communication equipment.<ref name="Korean War : Weapons of the United Nations">{{Cite book |last=Bak |first=Dongchan |url=http://medcmd.mil.kr/user/imhc/upload/pblictn/PBLICTNEBOOK_202105270240172800.pdf |title=Korean War : Weapons of the United Nations |publisher=Ministry of Defense Institute for Military History |date=March 2021 |isbn=979-11-5598-079-8 |location=Republic of Korea |pages=133–136 |language=Korean |access-date=27 June 2022 |archive-date=20 September 2022 |archive-url=https://web.archive.org/web/20220920170621/http://medcmd.mil.kr/user/imhc/upload/pblictn/PBLICTNEBOOK_202105270240172800.pdf |url-status=dead }}</ref>

In December 1950, 14 tanks were organized into "Cooper Force", led by Captain Donald Ashley-Cooper, and were deployed to Jangheung, [[Yangju]] to support the 1st Battalion, [[Royal Ulster Rifles]] Regiment, whose duty was to defend northwest of [[Seoul]]. On the night of 3 January 1951, the 1st Battalion of the Royal Ulster Rifles and Cooper Force retreated under orders from superior command to withdraw. During the process, 157 soldiers were killed and all the tanks were destroyed or abandoned as they escaped along the gorge without protection provided by friendly units.<ref name="Korean War : Weapons of the United Nations"/>

One of the captured Cromwells operated by the communist forces was destroyed by a British Centurion tank near [[Hangang Railway Bridge]] on February 1. Another captured tank, deployed to [[Wolmido]] near [[Incheon]] by the communists, was recaptured by South Korean marines on February 10.<ref name="Korean War : Weapons of the United Nations"/> American marines helped South Korean marines to repair the recaptured Cromwell for usage. However, the ''Marine Cromwell'' only rolled for a few days until it was handed back to its original owner, the British.<ref>{{Cite book |last=Choe |first=Yeongseop |title=6.25 바다의 전우들 |publisher=Sechang Publish |date=20 May 2013 |isbn=9788955861785 |location=South Korea |pages=182–185 |language=Korean}}</ref>

Cromwell tanks were used by Czechoslovakia and Israel.

Fifty-two Centaur I tanks were donated in early 1946 to the [[Greek Army]] during the opening stages of the [[Greek Civil War]] but they were kept in storage due to the lack of trained personnel. In 1947, the first Greek officers returned from training courses in the United Kingdom and training of tank crews began. In April 1948, the Centaurs were organised in three Centaur tank companies, initially numbered II, IX and XI, but a year later were renumbered 381, 382, and 383 and temporarily attached to reconnaissance regiments 391, 392, and 393. The Centaurs saw limited service in the war because battles were fought mainly in mountainous areas, but proved useful in supporting infantry units and in defence of inhabited areas. After the end of the war, in October 1949, the three Centaur companies were organised into the 391 Tank Regiment. The Centaurs were replaced by US built [[M47 Patton|M47s]] and in 1962 were sold and scrapped.<ref>Hellenic Army General Staff / Training Directorate (Γενικό Επιτελείο Στρατού / Διεύθυνση Εκπαιδεύσεως), ''History of Cavalry and Tank Corps'' [Ιστορία Ιππικού Τεθωρακισμένων], Athens, 1995</ref> One Centaur is preserved in the Greek Army Tank Museum.<ref>{{cite web |url=http://army.gr/structure/eng/istoria/mouseia/mouseio_armatwn/index.html |title=Tanks Museum |access-date=2017-04-15 |url-status=dead |archive-url=https://web.archive.org/web/20170905030239/http://www.army.gr/structure/eng/istoria/mouseia/mouseio_armatwn/index.html |archive-date=5 September 2017 |df=dmy-all }}</ref>

The British Army, Austria and Jordan used the larger-gunned [[Charioteer (tank)|Charioteer]] development of the Cromwell post-war. Jordanian vehicles saw action in conflicts in the Middle East.

==Operators==
[[File:La Panne Belgie 1945.jpg|thumb|Czechoslovak soldiers on a Cromwell tank near [[Dunkirk]] in 1945.]]
* {{flag|Czechoslovakia}}
* {{flag|Greece|old}}
* {{flag|France}}: in 1944, up to 150 Cromwell-type tanks was provided to the French army.{{citation needed|date=November 2024}} some sources suggest those were all Centaur I and Cavalier I.{{which|date=November 2024}} The 4th Cuirassiers Regiment received Cromwell VIIs in March 1945.<ref name=":2">Stephane Weiss, "Le jour d'après" : organisations et projets militaires dans la France libérée : août 1944 - mars 1946, Université Lumière-Lyon-II, 2016-09-20, p. 253 & 578-585</ref> Those were scrapped in 1945 and the turret was used to build fortifications in Indochina.{{citation needed|date=November 2024}} 
* {{flag|Israel}}
* {{flag|North Korea}}: Handful captured from the British ''Cooper Force'' during the Korean War.<ref name="Korean War : Weapons of the United Nations"/>
* {{flag|South Korea}}: 1 recaptured from North Korea then returned to the United Kingdom.<ref name="Korean War : Weapons of the United Nations"/>
* {{flag|Poland}} : a regiment of 1st Armoured Division, which served in North West Europe in 1944-45
* {{flag|Portugal}}
* {{flag|United Kingdom}}

<!-- hidden for now place for armour disposition and other specification
==Armour disposition==
| class="wikitable"
|-
|+Armour<ref>"Cromwell plate thickness" TD.8401</ref>
|-
|Front hull
| 25 mm (sloped) – 64 mm (vertical)
|-
|Turret front
| 64 mm
|-
|Turret roof
| 20 mm
|-
|Turret sides
| 44 – 64 mm
|-
|Hull side
| 14 + 29 mm
|-
|Hull top
|
|-
|Hull rear
|14 – 32 mm
|-
| -->

==Variants==
[[File:Cromwell tank hierarchy.png|center]]

Development of hull types and armaments occurred independently. Hull types applied to all variants. A single mark could cover up to four types, and a type up to six marks making classification complex. Combinations of mark and type were applied by different manufacturers.<ref>''Cromwell Tank'' p. xiii</ref>

===Cromwell===
[[File:The British Army in the United Kingdom 1939-45 H37168.jpg|thumb|A Cromwell IV of the [[Welsh Guards]] displays its speed at [[Pickering, North Yorkshire|Pickering]] in [[Yorkshire]], 31 March 1944]]

;Cromwell I: Early vehicles armed with the Royal [[Ordnance QF 6 pounder]] (57&nbsp;mm) gun (with 64 rounds of ammunition). Only 357 produced{{Citation needed|date=August 2007}} due to the switch from the 6 pounder (57&nbsp;mm) to the 75&nbsp;mm gun.

;Cromwell II: Pilot vehicle built by Vauxhall with cast turret similar to [[Churchill tank|Churchill VII]]. This did not enter production.

;Cromwell III: Centaur I hull fitted with Meteor V12 engine to A27M standard.{{sfn|Chamberlain|Ellis|1981|p=44}} Turret houses Royal [[Ordnance QF 6 pounder]]. Only ~ 200 produced{{Citation needed|date=August 2007}} due to scarcity of Centaur I's.

;Cromwell IV: Centaur III hull re-engined with Meteor engine.{{sfn|Chamberlain|Ellis|1981|p=44}} Turret houses [[Ordnance QF 75 mm|75 mm ROQF Mk V]] gun. Later Cromwell IV's saw the introduction of the Final Specification, changing some features (such as track-adjuster) to normal Cromwell standard. The most numerous variant with over 1,935 units produced.{{Citation needed|date=August 2007}}

;Cromwell V: Cromwell built to Final Specification and armed with the 75&nbsp;mm gun.

;Cromwell VI: Cromwell built to Final Specification and armed with 95&nbsp;mm howitzer. 341 produced.{{Citation needed|date=August 2007}}
[[File:1 Dywizja Pancerna - ćwiczenia przed inwazją na kontynent (18-328-45).jpg|thumb|right|Cromwell VII of the [[1st Armoured Division (Poland)|1st Armoured Division]].]]
;Cromwell VII: Upgrade to Cromwell IV, V, and VI armed with the 75&nbsp;mm gun. Some hulls were upgraded with features from later hull types. Wider (15.5&nbsp;inch) tracks, and upgraded suspension (where not fitted earlier in the production programme). These were introduced very late in the war and did not see much in the way of combat. ~ 1,500 produced, Some saw combat in the [[Korean War]] and many were later converted to [[Charioteer tank|FV4101 Tank, Medium Gun, Charioteer]].{{citation needed|date=February 2016}}

;Cromwell VIII: Cromwell VI reworked with same upgrades as VII but retaining the 95&nbsp;mm howitzer.

===Centaur===
[[File:Centaur IV tank of 'H' Troop, 2nd Battery, Royal Marine Armoured Support Group, 13 June 1944. B5457.jpg|thumb|Centaur IV of [[Royal Marine Armoured Support Group]], Normandy 13 June 1944]]

;Centaur I: Armed with the Royal [[Ordnance QF 6 pounder]] (57&nbsp;mm) gun (with 64 rounds of ammunition). It was used only for training. 1,059 produced.{{Citation needed|date=August 2007}}

;Centaur II: Mark I with wider tracks and no hull machine gun. Experimental only.

;Centaur III: Centaur armed with the [[Ordnance QF 75 mm|75 mm ROQF Mk V]] gun. In 1943, most Centaur I were converted to IIIs, but a few remained as such. 233 produced.{{Citation needed|date=August 2007}}

;Centaur IV: Centaur armed with [[Ordnance QF 95mm Howitzer|a 95 mm howitzer]] (with 51 rounds of ammunition). This is the only version of the Centaur known to have seen combat, in service with the [[Royal Marines Armoured Support Group]]. The vehicles were fitted with wading gear to get them ashore. Trunking waterproofed the engine inlets and covers were fitted to the guns. 114 produced.<ref>{{cite book |first=Leland |last=Ness |title=Jane's World War Two Tanks and Fighting Vehicles |page=22}}</ref>

[[File:Centaur Bulldozer.jpg|right|thumb|Centaur Bulldozer]]
;Centaur Bulldozer: A Centaur tank with the turret removed and installed a simple winch-operated bulldozer blade. Used as armoured obstacle-clearing vehicle. Issued to the 79th Armoured Division in Belgium during the latter part of 1944.

===Hull variants===
[[File:Tanks and Afvs of the British Army 1939-45 KID961.jpg|thumb|Cromwell VI with type F hull, showing driver's side-opening hatch and turret storage bins]]
[[File:Tanks and Afvs of the British Army 1939-45 KID949.jpg|right|thumb|Cromwell VIIw with type Dw or Ew hull, showing welded construction with applique armour]]

Hull types ranged from type A to type F. Each type applied a different package of changes to the hull design to different marks of tank.{{sfnp|Fletcher|Harley|2006 |p=}}{{page needed|date=January 2021}} Changing the vehicle type allowed the introduction of changes without changing the overall offensive capability.
{| class="wikitable"
|-
!Cromwell type
!Construction
!Major features
!Cromwell Mark
|- valign=top
|A
|Riveted
|First version with:
* Top opening driver & hull gunner hatch
* 4 lockers
* Layered 6&nbsp;mm + 8&nbsp;mm floor plate
|
* Cromwell I
* Cromwell III
* Cromwell X
* Cavalier I
|-valign=top
|B
|Riveted
|As A, but:
* Side opening hatch for hull gunner
* 3 lockers
* Hull gunner periscope deleted
|
* Centaur I
* Cavalier I
|-valign=top
|C
|Riveted
|As B, but:
* Engine compartment armour reduced to save weight
Later vehicles added:
* Hull gunner periscope reinstated
* Revised trackguards
|
* Cromwell I
* Cromwell III
* Cromwell IV
* Cromwell V
* Centaur I
* Centaur III
* Centaur IV
|-valign=top
|D
|D: Riveted
Dw: Welded
|As C, but:
* Engine deck redesigned for ease of access to radiators
* Hull gunner periscope
* Revised trackguards
On welded vehicles:
* Single-piece pivot-opening driver hatch
* Applique armour
|
* Cromwell IV
* Cromwell Vw (welded)
* Cromwell VI
* Centaur III
* Centaur IV
|-valign=top
|E
|E: Riveted
Ew: Welded
|As D, but:
* 14&nbsp;mm single skin floorplate to hull
On welded vehicles:
* Lower ratio final drives
|
* Cromwell IV
* Cromwell Vw (welded)
* Cromwell VI
|-valign=top
|F
|Riveted
|As E, but:
* Driver and hull gunner side opening escape doors
* 2 lockers
* 2 turret bins replacing the removed lockers
* towing rope on front glacis
Later vehicles added:
* Sprung towbar
|
* Cromwell IV
* Cromwell VI
|}

==Vehicles based on chassis==<!-- This section is linked from [[Yad La-Shiryon]] -->

===Conversions===
A number of further vehicles were based on the Cromwell tank hull, either re-working existing vehicles or built from scratch with the Cromwell as the basis:

;Cromwell command
:The main gun was removed and it carried one each of the No. 19 (low power) and No. 19 (high power) wireless sets. These were used by brigade and divisional headquarters.<ref name="CCT4250">{{harvnb|Fletcher| Harley|2006 |p=34 }}</ref>
;Cromwell observation post
: Cromwell IV, Cromwell VI, or Cromwell VIII fitted with extra radio equipment; 2 x No. 19 and 2 x No. 38 (portable) radios. The main gun was retained.<ref name="CCT4250"/>
;Cromwell control
:Two No. 19 low power radios. Main armament kept. Used by regimental headquarters<ref name="CCT4250"/>
;Centaur, AA Mk I: Used a Crusader III, anti-aircraft Mk II turret fitted with twin [[Polsten|20 mm Polsten guns]] instead of Oerlikons.{{sfn|Chamberlain|Ellis|1981|p=41}} Were originally deployed in Normandy, but withdrawn as unnecessary due to Allied air superiority. 95 were produced.{{Citation needed|date=August 2007}}
;Centaur, AA Mk II: Same turret as Crusader III, AA Mk III but with twin 20&nbsp;mm Polsten AA guns.
[[File:Centaur dozer.jpg|right|thumb|Centaur dozer with hydraulic operated blade]]
;Centaur dozer: A Centaur with the turret removed and given a simple dozer blade operated by a winch. Since the winch passed over the top of the hull it was not possible to retain the turret. Issued one per Cromwell squadron and to RE.{{sfn|Chamberlain|Ellis|1981|p=41}} One of "[[Hobart's Funnies]]". 250 produced.
;Centaur observation post (OP): A Centaur with a dummy main gun, and extra radio communications.
;Centaur Kangaroo: A Centaur with turret removed to make space for passengers. (Few produced)
;Centaur armoured recovery vehicle (ARV): A Centaur with turret removed, and replaced with [[winch]] fitted instead, and an optional [[A-frame]].

Post-war, a number of Cromwells were upgraded to meet the new [[Cold War]] threat:
;FV 4101 Charioteer: Cromwell hull with a [[Ordnance QF 20 pounder|QF 20-pounder gun]] in a tall turret, designed in the 1950s to give more fire support. 200 produced.

===Designs based on the Cromwell===
The Cromwell tank design was also used as the basis for the design other vehicles:
* [[Cruiser Mk VIII Challenger]] (A30): combined a lengthened Cromwell chassis with widened superstructure to mount the 17-pounder gun in a new turret.
* A30 Avenger SP 17pdr, a version of the Challenger using a lighter more open turret as a self-propelled gun role.
* [[Excelsior tank|Excelsior (Tank, Heavy Assault, A33)]], an experimental design with elements of an [[infantry tank]] as a possible replacement for the [[Churchill tank]].<ref name=E&C80 /> When the Churchill continued to meet requirements, development was halted.<ref name=E&C80 />
* [[Comet (tank)|Comet (A34)]], A tank based on lessons learned from the Cromwell development, incorporating a larger turret ring, enabling the use of a more powerful [[Ordnance QF 17-pounder#77 mm HV|77 mm HV gun]] (17-pounder with shorter barrel). This tank reflects much of what was intended for the Cromwell.

The Challenger was ordered into production in limited numbers and saw service alongside the Cromwell, the Comet entered service later in the war.

The A31 and A32 were attempts to convert the Cromwell to an infantry tank that never got beyond the design stage.<ref name=E&C80>{{cite book | last1=Chamberlain | first1=Peter | last2=Ellis | first2=Chris | title=British and American Tanks of World War II | page=80|date=1969 | publisher=Arms & Armour P. | isbn=0-85368-033-7}}</ref>

The majority of following British tank designs utilised the Meteor engine and Merritt-Brown steering and gearbox combination initially developed for the Cromwell, lasting all the way through the [[Centurion tank|Centurion]]. This proved to be one of the primary elements in the development of the [[main battle tank]].

==Surviving vehicles==
[[File:Memorial To 7th Armoured Division Desert Rats - geograph.org.uk - 299386.jpg|thumb|Cromwell IV memorial to the 7th Armoured Division (Desert Rats) [[Ickburgh]] in [[Norfolk]]]]
Around 56 Centaur and Cromwell tanks survive, ranging from scrapyard wrecks to fully restored museum vehicles.

===Cromwell tanks===
Around 26 Cromwell tanks exist in various states.
* Cromwell I. [[Royal Australian Armoured Corps Memorial and Army Tank Museum]], Puckapunyal, Victoria, Australia. Cromwell MkI shipped to [[Australia]] to assist with the up gunning of the [[Sentinel tank|Australian Cruiser tanks]] but did not arrive before that programme had been terminated. Repainted with the markings it arrived in Australia with, it is now under cover on display at the museum.
* Cromwell IV. [[The Tank Museum]], Bovington, [[Dorset]], England.<ref>{{cite web|url=http://www.tankmuseum.org/museum-online/vehicles/object-e1949-342 |title=Tank Cruiser Mark VIII A27M, Cromwell IV (E1949.342) |publisher=The Tank Museum |access-date=21 March 2018}}</ref>
* Cromwell IV Command Tank ''T187617''. [[Imperial War Museum Duxford]], [[Cambridgeshire]], England.<ref name="the.shadock.free.fr">{{citation |url=http://the.shadock.free.fr/Surviving_Centaur_Cromwell_Tanks.pdf  |title=Surviving Centaur and Cromwell Tanks |work=Surviving Panzers website|date= 5 May 2019}}</ref>
* Cromwell IV on [[A1065 road]] [[Thetford Forest]], [[Norfolk]], England, as part of a memorial to [[7th Armoured Division (United Kingdom)|7th Armoured Division]] ("Desert Rats") whose armoured regiments had trained there prior to embarking for Normandy.<ref name="thetford">{{cite web|url=http://www.forestry.gov.uk/website/ourwoods.nsf/LUWebDocsByKey/EnglandEastAngliaNoForestThetfordForestParkHighAshDesertRatWalk |title= Desert Rat Walk |access-date= 8 November 2010 |publisher=Forestry Commission }}</ref>
* Cromwell IV Rick Wedlock Collection, UK. In running condition.<ref name="the.shadock.free.fr"/>
* Cromwell IV. [[Overloon War Museum|National War and Resistance Museum]], Overloon, Netherlands. Recovered after the [[Battle of Overloon]] in October 1944.
* Cromwell IV. Heintz Barracks, [[Bastogne]], Belgium. In running condition.<ref name="the.shadock.free.fr"/>
* Cromwell IV Wilrijk, Antwerp, Belgium. This was unveiled in September 2014 for the 70th anniversary of the liberation of the city in 1944.<ref>{{cite web|title=Cromwell Tank - Antwerpen|url=http://nl.tracesofwar.com/artikel/6821/Cromwell-Tank.htm|website=TracesOfWar|access-date=23 December 2014}}</ref>
* Cromwell IV. [[Military Museum Lešany|Army Technical Museum, Lesany]], Czech Republic. In running condition.<ref name="the.shadock.free.fr"/>
* Cromwell IV "Faust". Private collection, Czech Republic. In running condition.<ref name="the.shadock.free.fr"/>
* Cromwell IV. [[Kubinka Tank Museum]], Russia.<ref>{{cite web|url=http://preservedtanks.com/Profile.aspx?UniqueID=545|title=Preserved Tanks .Com - Tank Profile|website=preservedtanks.com|access-date=21 March 2018}}</ref>
* Cromwell IV. Museum of Zadorozhniy Tec, Russia.
* Cromwell IV and a Cromwell III. [[Yad La-Shiryon|Yad la-Shiryon]] Museum, Latrun, Israel. Were used by the [[IDF]] in War of Independence (1948–1949).
* Cromwell IV "Blenheim". [[American Heritage Museum]], [[Stow, Massachusetts]], USA.<ref name="the.shadock.free.fr"/> In running condition.
* Cromwell IV. Private Collection, St. Louis, Missouri, USA.
* Cromwell IV. [[The Wheatcroft Collection]], UK. Unrestored wreck.
* Cromwell IV(A27M). Adrian Barrell Collection, UK. Currently just a restored hull with no turret.<ref name="the.shadock.free.fr"/>
* Cromwell IV. Rex & Rod Cadman Collection, UK. Unrestored wreck.
* Cromwell IV. Heintz Barracks, Bastogne, Belgium. A wreck and not restored.
* Cromwell IV. Army Technical Museum, Lesany, Czech Republic. A wreck with no turret.
* Cromwell IV. Handmet Military, Gostyń, Poland. A wreck with no turret.
* Cromwell IV. Vojenské Museum, Králíky, Czech Republic. A wreck with no turret.
* Cromwell IV. Smržovka private tank museum, Czech Republic. Currently a wreck and not restored.
* Cromwell IV. Smržovka private tank museum, Czech Republic. A wreck with no turret.
* Cromwell IV.[[The Wheatcroft Collection]], UK.
* Cromwell IV. Private collection, Czech Republic. This Cromwell hull was a spare parts donor for the restoration of the Cromwell nicknamed "Faust"

===Centaur tanks===

Around 17 Centaurs and 9 Centaur Dozers exist in various states.
{{div col|colwidth=48em}}
* Centaur I. [[Muzeum Broni Pancernej Centrum Szkolenia Wojsk Lądowych]], Poznań, Poland. Being restored to running condition (as of March 2015).<ref name="the.shadock.free.fr"/>
* Centaur I. Hellenic Army Armor Museum, Athens, Greece. The Greek Army received 52 Centaur I tanks from the British in 1946.
* Centaur IV T215477. Cobbaton Combat Collection, Devon, England. In running condition.
* Centaur IV. [[Musée des Blindés]], Saumur, France.<ref name="the.shadock.free.fr"/>
* Centaur IV T185102 ''Vidette'' 95mm. Memorial Pegasus Bridge Museum, [[Ranville]], France.<ref name="the.shadock.free.fr"/><ref>{{cite web |url=http://www.normandie44lamemoire.com/versionanglaise/fichesvillesus/benouvarqueus2.html |title=Benouville and St-Aubin-d'Arquenay |publisher=Normandie44lamemoire.com |access-date=2 October 2013 |work=1944 The Battle of Normandy The Memory |archive-url=https://web.archive.org/web/20131003103645/http://www.normandie44lamemoire.com/versionanglaise/fichesvillesus/benouvarqueus2.html |archive-date=3 October 2013 |url-status=dead }}</ref>
* Centaur IV ''T185075'' . [[Hermanville-sur-Mer|La Brèche d'Hermanville]] (Sword Beach), France.<ref>{{cite web |url=http://www.normandie44lamemoire.com/versionanglaise/fichesvillesus/hermanlabreus2.html |title=Hermanville-s-M. and La Brèche d'Herm. |publisher=Normandie44lamemoire.com |work=1944 The Battle of Normandy The Memory |access-date=2 October 2013 |url-status=dead |archive-url=https://web.archive.org/web/20131219163158/http://www.normandie44lamemoire.com/versionanglaise/fichesvillesus/hermanlabreus2.html |archive-date=19 December 2013 |df=dmy-all }}</ref> A Cromwell dozer with Cavalier turret to resemble Centaur support tank.{{citation needed|date=September 2020}}
* Centaur IV. Calcada da Ajuda, Lisboa, Portugal. About 24 tanks were sold to Portugal.<ref name="the.shadock.free.fr"/>
* Centaur IV. Portuguese Army Cavalry School Museum, Santarém, Portugal. Mounted on a plinth in the town
* Centaur IV. Portuguese Army Cavalry School Museum, Santarém, Portugal.
* Centaur IV. Santa Margarida da Coutada, Portugal.<ref name="the.shadock.free.fr"/>
* Centaur IV. Amadora, Portugal. Two at Military Academy.
* Centaur IV. Two found 8 miles offshore in [[Bracklesham Bay]], West Sussex, England. Discovered in a good state of preservation in the [[Solent]], but are unlikely to be recovered.<ref name="solent discovery">{{cite news|url=https://www.bbc.co.uk/news/uk-england-hampshire-14322864 |title= Isle of Wight's sunken World War II tanks studied |access-date= 31 August 2022 |publisher=BBC |date=28 July 2011}}</ref>
* Centaur IV. Dennis Roberts Collection, UK. In running condition.
* Centaur VII. Rex & Rod Cadman Collection, Kent, England. Wreck of a Mark VII.<ref name="the.shadock.free.fr"/>
* Centaur VII T217875. Kevin Powles Collection. Vehicle under restoration.<ref>{{cite web|url=http://hmvf.co.uk/forumvb/showthread.php?35747-Centaur-Gun-Tank-Ressurection!|title=Centaur Gun Tank Ressurection!(sic).|website=HMVF - Historic Military Vehicles Forum|date=7 December 2012 |access-date=21 March 2018}}</ref>
* Centaur VII. [[Salisbury Plain Training Area]], England. Used as live fire target.<ref name="the.shadock.free.fr"/>
* Centaur VII. Oberhoffen-sur-Moder, France. Wreck of Centaur VII stored outside with other tank wrecks.<ref name="the.shadock.free.fr"/>
* Centaur Dozer. Private Collection, UK. Tank restored to working order.<ref name="the.shadock.free.fr"/>
* Centaur Dozer ''T186642''. [[The Tank Museum]], [[Dorset]], England. Restored.<ref>{{cite web|url=http://www.tankmuseum.org/ixbin/indexplus?_IXSS_=_IXMENU_%3dtop%26ALL%3dcromwell%26_IXACTION_%3dsummary%26%252asform%3d%252fsearch_form%252fbovtm_combined%26TYPE%3darticle%26_IXFPFX_%3dtemplates%252fsummary%252f&_IXFIRST_=2&_IXSPFX_=templates/full/tvod/t&_IXMAXHITS_=1&submit-button=summary&_IXSESSION_=&_IXMENU_=Vehicles |title=Centaur Dozer Mark 1 (E1985.32) |publisher=The Tank Museum |access-date=2 October 2013}}</ref>
* Centaur Dozer. Isle of Wight Military Museum, Hampshire, England. Restored, 79th Armoured Division insignia painted on hull front.<ref>{{cite web|url=http://preservedtanks.com/Profile.aspx?UniqueID=2300|title=Preserved Tanks .Com - Tank Profile|website=preservedtanks.com|access-date=21 March 2018}}</ref>
* Centaur Dozer. formerly of Isle of Wight Military Museum, Hampshire, England. Not restored in bad condition.<ref>{{Citation |archive-url=https://web.archive.org/web/20220403163720/http://the.shadock.free.fr/Surviving_Centaur_Cromwell_Tanks.pdf| archive-date=3 April 2022 |url=http://the.shadock.free.fr/Surviving_Centaur_Cromwell_Tanks.pdf |work=Surviving Panzers website |title=Surviving Centaur and Cromwell Tanks |date=8 July 2021}}</ref>
* Centaur Dozer T185462. Ian Galliers Collection [[UK]]. Unrestored in bad condition.<ref name="the.shadock.free.fr"/>
* Centaur Dozer. Armoured Corps Museum, [[Ahmednagar]], Maharashtra, India.
* Centaur Dozer ''T185484''. Armoured Corps Museum, Ahmednagar, Maharashtra, India.
* Centaur Dozer. Rex & Rod Cadman Collection, UK. Unrestored in bad condition.<ref name="the.shadock.free.fr"/>
* Centaur Dozer. Rex & Rod Cadman Collection, UK. Unrestored in bad condition.<ref name="the.shadock.free.fr"/>
{{div col end}}

===Others===
There are also a few chassis of indeterminate origin which might be either Centaur or Cromwells.
* Two hulls at The Tank Museum, Dorset, England.
* A hull in the Rex & Rod Cadman Collection, UK
* A hull and a dozer hull owned by Staman International Trading, Nijverdal, Netherlands.
* A dozer hull, Defence Services Museum, Myanmar

<gallery mode="packed">
Image:Centaur front.jpg|Centaur IV behind Sword Beach, Normandy, France
Image:Puckapunyal-Cromwell-2.jpg|A Cromwell Mk. 1 displayed at the Royal Australian Armoured Corps Tank Museum, Puckapunyal, Australia (2007). The white writing on the turret is to inform cargo handlers that it is not to be transported by sea as deck cargo.
Image:Centaur Dozer at the Tank Museum 02.JPG|Centaur Dozer at the Tank Museum
Image:Tank Mark VIII Centaur in the Musée des Blindés, France, pic-5.JPG|Tank Mark VIII Centaur in the Musée des Blindés, France
</gallery>

==See also==
* [[Rhino tank]]
* [[Vickers Tank Periscope MK.IV]]

===Tanks of comparable role, performance, and era===
{{Div col|colwidth=25em}}
* Australia [[Thunderbolt tank|Thunderbolt]]
* Canadian [[Grizzly I cruiser|Grizzly I]]
* German [[Panzer IV]]
* Hungarian [[40M Turán|Turán III]]
* Italian [[Carro Armato P 40]]
* Italian [[P43 tank|P43]] (proposal)
* Japanese [[Type 3 Chi-Nu]]
* Romanian [[1942 medium tank (Romania)|1942 medium tank]] (proposal)
* Soviet [[T-34]]
* Swedish [[Stridsvagn m/42]]
* United States [[M4 Sherman]]
{{div col end}}

==Notes==
{{Notelist}}

== References ==
=== Footnotes ===
{{Reflist}}

=== Bibliography ===
* {{cite web |url=http://www.wwiivehicles.com/unitedkingdom/cruiser/mk-viii-a27m.asp |title=Britain's Cruiser Mk VIII Cromwell (A27M) Tanks |work=World War II Vehicles |access-date=12 May 2009}}
* {{cite book |series=AFV Weapons Profile |number=25 |title=Cromwell and Comet |last=Bingham |first=James |publisher=Profile Publishing |location=Windsor |date=1971 |oclc=464097593 }}
* {{cite book |url=https://books.google.com/books?id=JZ9cSQNeK9cC |title=The Encyclopedia of Weapons of World War II: The Comprehensive Guide to Over 1,500 Weapons Systems, Including Tanks, Small Arms, Warplanes, Artillery, Ships and Submarines |first=Chris |last=Bishop |publisher=Sterling Publishing Company |date=2002 |isbn=978-1-58663-762-0 |page=26}}
* {{cite book |last1=Chamberlain |first1=Peter |last2=Ellis |first2=Chris |title=British and American Tanks of World War II |date=1981|publisher=Arco publishing |orig-date=1969}}
* {{Book-Fletcher-Great Tank Scandal}}{{sfn whitelist|CITEREFFletcher,_Great_Tank_Scandal}}
* {{Book-Fletcher-Universal Tank}}
* {{cite book
 | last = Fletcher | first = David
 |author-link=David Fletcher (military historian)
 | title = Cromwell Tank: Vehicle History and Specifications
 | publisher = HMSO
 | series = The Tank Museum
 | date = 1983
 | isbn = 0-11-290403-3
}}
* {{cite book
 | title=Cromwell Cruiser Tank 1942-1950 |series =New Vanguard 104
 | first1=David |last1=Fletcher
 | author-link=David Fletcher (military historian)
 | first2=Richard C. |last2=Harley
 | date=2006
 | publisher=Osprey Publishing
 | isbn=1-84176-814-6
}}
* {{cite magazine |work=Tankette |issue=49/2 |title=Cromwell kitography Part 1 |last=Harley |first=Richard C. |publisher=Miniature Armoured Fighting Vehicle Association (MAFVA) |location=UK |date=2014}}
* {{cite book |last= Robotham  |first= William Arthur |title= Silver Ghosts and Silver Dawn |date= 1970 |publisher= Constable |location= London }}
* {{cite book |last= Higgins |first= David R. |title= Cromwell vs Jagdpanzer IV: Normandy 1944 |series=Duel 86 |date= 2018 |publisher= Osprey Publishing |isbn=9781472825865}}

==External links==
{{Commons}}
* OnWar specifications: [https://web.archive.org/web/20070930201527/http://www.onwar.com/tanks/uk/fcromwell1.htm Cromwell I], [https://web.archive.org/web/20080509081003/http://www.onwar.com/tanks/uk/data/cromwell4.htm Cromwell IV]
<!-- * [http://users.swing.be/tanks.tanks/complet/622.html LemaireSoft] hidden deadlink, might be updated version out there -->
* [http://henk.fox3000.com/cromwell.htm Henk of Holland] {{Webarchive|url=https://web.archive.org/web/20090804171458/http://henk.fox3000.com/cromwell.htm |date=4 August 2009 }}
<!-- * [http://www.geocities.com/nasenoviny/CromwellEN.html Nase noviny] also dead, moved after yahoo shut down geocities? -->
* {{cite web |url=http://www.modellismopiu.net/m+gallerie/main.php?g2_itemId=512580 |work=Modellismopiu Gallery |title=Cromwell Mk.III}}
* {{cite web |url=http://www.modellismopiu.net/m+gallerie/main.php?g2_itemId=23515 |work=Modellismopiu Gallery |title=Centaur}}
* {{cite web |url=http://www.modellismopiu.net/m+gallerie/main.php?g2_itemId=722493 |work=Modellismopiu Gallery |title=Cromwell}}
* {{cite web |url=https://www.svsmgallery.com/Top-level/Walkarounds/Armored-Vehicles/Tanks-1915-to-1945/Centaur-Cruiser-Tank-Mk-VIII-A27L-Musee-des-Blindes-Saumur/ |work=SVSM Gallery |title=Centaur, Cruiser Tank Mk VIII (A27L), Musee des Blindes, Saumur, France}}

{{WWIIBritishAFVs}}
{{WWII tanks|style=wide}}
{{Subject bar
| portal2=United Kingdom
}}
{{Authority control}}

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