The Tank, Infantry, Mk IV (A22) Churchill
was a British heavy infantry tank used in the Second World War, best known for its heavy armour, large longitudinal chassis with all-around tracks with multiple bogies, its ability to climb steep slopes, and its use as the basis of many specialist vehicles. It was one of the heaviest Allied tanks of the war.
The origins of the design lay in the expectation that war in Europe might be fought under similar conditions to those of the First World War, and emphasized the ability to cross difficult ground. The Churchill was rushed into production to build up British defences against a possible German invasion. The first vehicles had flaws that had to be overcome before the Churchill was accepted for wide use. After several marks had been built, a better armoured version, the Mark VII, entered service.
The Churchill was used by British and Commonwealth forces in the North Africa campaign, in Italy, and in northwest Europe. In addition, a few hundred were supplied to the USSR and used on the Eastern Front.Name
The Churchill tank was named after Prime Minister Winston Churchill, who had promoted the development of the tank in the First World War. Churchill told Field Marshall Jan Smuts "That is the tank they named after me when they found out it was no damn good!
The name only incidentally matched what became the British Army practice of giving service names beginning with C to cruiser tanks, such as the Covenanter, Crusader, and the later Cromwell, Cavalier and Comet. Infantry tank naming had no particular pattern. Post-war, the merging of the cruiser and infantry tank lines in the 'universal' or main battle tanks continued with C names: Centurion, Conqueror, Chieftain, and Challenger.HistoryA20
Initially specified before the outbreak of the Second World War the (General Staff designation) A20 was to be the replacement for the Matilda II and Valentine infantry tanks. In accordance with British infantry tank doctrine and based on the expected needs of World War I-style trench warfare, the tank was required to be capable of navigating shell-cratered ground, demolishing infantry obstacles such as barbed wire, and attacking fixed enemy defences; for these purposes, great speed and heavy armament were not required.
The vehicle was specified initially to be armed with two QF 2 pounder guns each located in a side sponson, with a coaxial BESA machine gun. A third BESA and a smoke projector would be fitted in the front hull. The specification was revised to prefer a turret with 60 mm of armour to protect against ordinary shells from the German 37 mm gun. Outline drawings were produced based on using the A12 Matilda turret and the engine of the Covenanter tank. Detail design and construction of the A20 was given to the Belfast shipbuilders Harland and Wolff who completed four prototypes by June 1940. During the construction period the armament was reconsidered, including fitting either a 6-pounder or a French 75 mm gun in the forward hull. In the end, a 3-inch howitzer was chosen. The A20 designs were short-lived, however, as at roughly the same time the emergency evacuation of the British Expeditionary Force from Dunkirk occurred.
At 43 tons, with a 300 hp flat-12 Meadows engine, the A20 had limited power compared to the 18-ton Covenanter. This was a less serious limitation than it might appear, owing to the British distinction between the high-speed cruiser tanks and the slow-speed infantry tanks. Vauxhall were approached to see if they could build the A20 and one example was sent to Vauxhall at Luton to see if they could provide an alternative engine. To this end, they developed a flat-12 petrol engine. For speed of production, this engine was based on a Bedford six-cylinder lorry engine, giving rise to its name of "Twin-Six". Although still a sidevalve engine, the engine was developed with high squish pistons, dual ignition and sodium-cooled exhaust valves in Stellite seats to give 350 bhp.A22
With France lost, the scenario of trench warfare in Northern Europe was no longer applicable and the design was revised by Henry Merritt,[note 2] Director of Tank Design at Woolwich Arsenal, based on the combat witnessed in Poland and France. These new specifications, for the A22 or Infantry Tank Mark IV, were given to Vauxhall in June 1940.
With German invasion of Britain looking imminent, and the loss of a substantial amount of military vehicles in the evacuation from France, the War Office specified that the A22 had to enter production within a year. By July 1940, the design was complete and by December of that year the first prototypes were completed; in June 1941, almost exactly a year as specified, the first Churchill tanks began rolling off the production line.
A leaflet from the manufacturer was added to the User Handbook saying:Fighting vehicles are urgently required, and instructions have been received to proceed with the vehicle as it is rather than hold up production.
All those things which we know are not as they should be will be put right.
The document then described known faults, with work-rounds and what was being done to correct the problem.
Because of its hasty development, there had been little testing, and the Churchill was plagued with mechanical faults. Most apparent was that the Churchill's engine was underpowered, unreliable, and difficult to access for servicing. Another serious shortcoming was the tank's weak armament, the 2 pounder (40 mm) gun, which was improved by the addition of a 3-inch howitzer in the hull to deliver a HE shell, albeit not on a howitzer's usual high trajectory.
Production of a turret to carry the QF 6 pounder gun began in 1941, but problems with the plate used in an all-welded design led to an alternative cast turret also being produced. These formed the distinction between Mark III and Mark IV.
The poor speed of the Churchill nearly caused production to be ceased in favour of the forthcoming Cromwell tank; it was saved by the successful use of the Mk III at the Second Battle of El Alamein in October 1942.
In the same year, the Churchill was also used at the Dieppe Raid.
The second major improved Churchill, the Mk VII, was first used in the Battle of Normandy in 1944. The Mk VII improved on the already heavy armour of the Churchill with a wider chassis and the British 75 mm gun which had been introduced on the Mk VI. It was primarily this variant, the A22F, which served through the remainder of war. It was re-designated A42 in 1945.
The Churchill was a versatile project and was used in numerous specialist roles.Design
The hull was made up of simple flat plates which were bolted together in earlier models and were welded in later models. The hull was split into four compartments: the driver's position at the front, then the fighting compartment including the turret, the engine compartment, and the gearbox compartment. The suspension was fitted under the two large "panniers" on either side of the hull, the track running over the top. There were eleven bogies either side, each carrying two 10-inch wheels. Only nine of the bogies normally took the vehicle weight, the front coming into play when the vehicle nosed into the ground or against an obstacle, the rear acting in part as a track tensioner. Due to the number of wheels, the tank could survive losing several without much in the way of adverse effects as well as traversing steeper terrain obstacles. As the tracks ran around the panniers, escape hatches in the side could be incorporated into the design. These were retained throughout the revisions of the Churchill and were of particular use when the Churchill was adopted as the AVRE.
The Bedford Vehicles engine was effectively two engines in horizontally opposed configuration ("flat twelve") on a common crankshaft. There were four Solex carburettors each on a separate manifold that fed three cylinders formed as a single cylinder head. The elements of the engine and ancillary components were laid out so they could be reached for maintenance through the engine deck covers. Air for the engine was drawn from the fighting compartment through air cleaners. Cooling air was drawn into the engine compartment through louvres on the sides, across the radiators and through the engine compartment by a fan driven by the clutch. This fan blew the air over the gearbox and out the rear of the hull. By opening a flap between the fighting compartment and the engine compartment this airflow could be used to remove fumes produced by firing the armament. The 1,296 cu in (21.238 L) capacity engine was rated at 350 bhp at 2,000 rpm delivering 960 lb⋅ft (1,300 N⋅m) torque over an engine speed range from 800 to 1,600 rpm.
The gearbox featured a regenerative steering system that was controlled by a tiller bar instead of the more commonplace brake levers, or as with the German Tiger I heavy tank, a steering wheel. The tiller was connected with servo assistance, hydraulically to the steering brakes. The Churchill was also the first tank to utilise the Merritt-Brown triple differential gearbox, which allowed the tank to be steered by changing the relative speeds of the two tracks; this effect became more pronounced with each lower gear, ultimately allowing the tank to perform a "neutral turn" when no gear was engaged, where it could fully pivot within its own length. There were final reduction gears, of the planetary type, in the driving wheels.
The first turrets were of cast construction and were rounded in shape, providing sufficient space to accommodate the relatively small 2 pounder gun. To fulfil its role as an infantry support vehicle, the first models were equipped with a 3-inch howitzer in the hull in a layout very similar to the French Char B. This enabled the tank to deliver a useful high-explosive capability while retaining the anti-tank capabilities of the 2 pounder. However, like other multi-gun tanks, it was limited by a poor fire arc - the entire tank had to be turned to change the aim of the hull gun. The Mk II dispensed with the howitzer and replaced it with a bow machine gun and on the Mk III, the 2 pounder was replaced with the 6 pounder, significantly increasing the tank's anti-tank capabilities. The tank underwent field modification in North Africa with several Churchills being fitted with the 75 mm gun of destroyed M4 Shermans. These "NA75" variants were used in Italy. The use of the 75 mm increased the effectiveness of the tank, as it was a generally superior weapon to the 6 pounder, possessing similar anti-tank capabilities, while also being considerably more effective when used in infantry support roles.
Churchills made use of the Vickers Tank Periscope MK.IV. In the Mark VII, the driver had two periscopes as well as a vision port in the hull front that could be opened. The hull gunner had a single periscope as well as the sighting telescope on the BESA machine gun mounting. In the turret the gunner and loader each had single periscope and the commander had two fitted in his hatch cupola.
The armour on the Churchill, often considered its most important feature, was originally specified to a minimum of 16 millimetres (0.63 in) and a maximum of 102 millimetres (4.0 in); this was increased with the Mk VII to a range from 25 millimetres (0.98 in) to 152 millimetres (6.0 in). Though this armour was considerably thicker than its rivals (including the German Tiger I tank, but not the Tiger II) it was not sloped, reducing its effectiveness. Earlier models were given extra armour by the expedient of welding extra plates on.
On the Mark VII, the hull front armour was made up of a lower angled piece of 5.5 in (140 mm), a nearly horizontal 2.25 in (57 mm) plate and a vertical 6 inch plate. The hull sides, were, for the most part, 3.75 in (95 mm). The rear was 2 in (51 mm) and the hull top 0.525 in (13.3 mm). The turret of the Mark VII was 6 in (150 mm) to the front and 3.75 in (95 mm) for the other sides. The turret roof was 0.79 (20 mm) thick. Plate was specified as IT 80, the cast sections as IT 90.
The A22F, also known as "Heavy Churchill" was a major revision of the design. The most significant part was the use of welding instead of riveted construction. Welding had been considered earlier for the Churchill but until its future was assured this was no more than testing techniques and hulls at the firing ranges. What welding reduced in the overall weight (estimates were around 4%), the thicker armour of the A22F made up for. Welding also required fewer man-hours in construction. The hull doors changed from square to round which reduced stresses. A new turret went with the new hull. The sides, which included a flared base to protect the turret ring, were a single casting while the roof, which did not need to be so thick, was a plate fitted to the top.
Since the engines on the Churchill were never upgraded, the tank became increasingly slow as additional armour and armament was equipped and weight increased; while the Mk I weighed 39,120 kg (40 long tons) and the Mk III weighed 39,630 kg, the Mk VII weighed 40,640 kg. This caused a reduction in the tanks' maximum speed from its original 26 km/h (16 mph) down to 20.5 km/h (12.7 mph). The engines also suffered from many mechanical problems.
Another problem was the tank's relatively small turret that prevented the use of powerful weapons; definitive versions of the tank were armed with either the QF 6-pounder or the derivative QF 75 mm gun. The 6-pdr was effective against armoured vehicles, but less so against other targets; the 75 mm was a better all-round weapon, but lacked in effectiveness against armour. Although the Churchills with their 6 pounders could outgun many contemporary German medium tanks (like the Panzer IV with the short-barrel 75 mm gun, and the Panzer III armed with the 50 mm gun) and the thick armour of all Churchill models could usually withstand several hits from any German anti-tank gun, in the later years of the war the German Panther tank had a 75 mm high-velocity cannon as its main armament along with increased protection, against which the Churchills' own guns often lacked sufficient armour penetration to fight back effectively.
The Churchill had many variations, including many specialised modifications. The most significant change to the Churchill was that it was up-gunned from 2 pounder to 6 pounder and then 75 mm guns over the course of the war. By the war's end, the late model Churchill Mk VII had exceptional amounts of armour – considerably more than the German Tiger tank. However, the firepower weakness was never fully addressed. The Mark VII turret that was designed for the 75 mm gun was of composite construction – cast with top and bottom plates welded into position.
While it had weaknesses, the Churchill could cross terrain obstacles that most other tanks of its era could not. This capacity frequently proved useful, especially during the fighting in Normandy. One action in Normandy where the tank's ability to surmount obstacles was found to be of value was the capture of Hill 309 on the 30 and 31 July 1944 (Operation Bluecoat) conducted by VIII Corps.Production
The Churchill tank was produced with Vauxhall as design parent. Subcontracted work on some tanks was provided by Whessoe Foundry & Engineering, Metropolitan‑Cammell Carriage and Wagon, Babcock & Wilcox Ltd., Newton, Chambers & Co. and the Gloucester Railway Carriage & Wagon Company produced some complete vehicles. Other contractors produced hulls and turrets which went to Vauxhall, Charles Roberts & Co., and Dennis Brothers for final assembly.Service HistoryDieppe Raid
The Churchill first saw combat on 19 August 1942, in the Dieppe Raid in France. The Dieppe raid was planned to temporarily take control of the French port of Dieppe using a strong force of about 6,000 troops – mostly drawn from inexperienced Canadian units. The operation, codenamed Rutter, would test the feasibility of opposed landings. Nearly 60 Churchill tanks from the Calgary Regiment were allocated to support the infantry and commandos; they would be put ashore by landing craft. Some problems were anticipated and allowed for: waterproofing of the hulls, canvas carpets to aid the tanks crossing the shingle beach, engineer teams to demolish obstacles and a few of the tanks were fitted with flame-throwers.
In the event, the German defences were strong and several tanks in each of the four "waves" were lost on or before reaching the beach. Only 14 got off the shore and past the sea wall. Although the tanks were effective in engaging the defenders in the town's buildings, their progress was blocked by concrete defences; the demolition teams – killed or pinned on the beach – had not been able to accompany the tanks. Some tanks were able to return to the beach once a withdrawal had been signalled but none was taken off. The surviving tank crews fought to cover the withdrawal of the infantry from the beach, and were captured after they had exhausted their main gun ammunition. Nearly 70% of the Canadians were killed, injured or captured and none of the raid's objectives were met other than the secret raid on the radar station on a headland.North Africa
Six Mk III Churchills (with the 6 pounder) saw action in the Second Battle of El Alamein in October 1942. This detachment, called "Kingforce", supported the attack of 7th Motor Brigade. The Churchills were fired on many times by Italian and German anti-tank guns, but only one was knocked out and partially caught on fire. One tank was said to have been hit up to 80 times.
Kingforce, formed to test whether the Churchills could operate in Africa, was disbanded after El Alamein. The 25th Army Tank Brigade of three regiments was sent to Africa, and went into action in February 1943 during the Tunisian campaign.
Churchill tanks took part in containing the German offensive of Operation Ochsenkopf in February – March 1943. At a place called Steamroller Farm, two Churchill Mk III tanks of 51 RTR got ahead of their squadron. They came across an entire German transport column which they ambushed and completely shot up before they rejoined. The end result was the destruction of two 88 mm, two 75 mm and two 50 mm, four lesser anti-tank guns, 25 wheeled vehicles, two 3-inch mortars, two Panzer III tanks and infliction of nearly 200 casualties.
A Churchill tank in a hull down defensive position made a particular contribution to Allied success. In one encounter on 21 April 1943, during the start of the Battle of Longstop Hill a Churchill tank of the 48th Royal Tank Regiment got the better of a German Tiger I heavy tank. A 6 pounder shot from the Churchill lodged between the Tiger's turret and turret ring, jamming the turret and injuring the German crew. They abandoned the Tiger, which was subsequently captured by the British. Known as Tiger 131, this Tiger was the first captured by the Western Allies and was particularly useful for intelligence. Tiger 131 has since been restored to full working condition and is now on display at the Bovington Tank Museum in the United Kingdom.Italy
As the mainstay of the Tank Brigades, which operated in support of the infantry, Churchill units were in operation more often than other tank units. The "NA75" conversions of Churchill Mark IIIs to carry the US 75 mm gun were used in Italy. As the Churchill proved to be a better gun platform than the Sherman, the effective range of the 75 mm was increased.North-West Europe
Churchills saw widespread action in Normandy during the Battle of Hill 112 and Operation Bluecoat, as well as subsequent operations in the Low Countries and into Germany, such as the fighting in the Reichswald during Operation Veritable. The Churchill was able to cross the muddy ground and force through the forests of the Reichswald; a contemporary report expressed the belief that no other tank could have managed the same conditions.Burma and India
A single Churchill, possibly a Mk V, was trialled in Burma in 1945. It was operated by the 3rd Dragoon Guards (Carabiniers) from the end of April 1945 for about a month. Although it proved impossible to bring the Churchill into action, on approach marches the tank proved at least the equal to the M3 Lee then in service.
The 254th Indian Tank Brigade returned to India from Burma, arriving at Ahmednagar during July 1945. The Brigade immediately began conversion from the Lee to the Churchill, the intention being for the newly equipped Brigade to return to operations in October 1945. At the time, it was assumed that the war against Japan would continue and that the new battleground would be Malaya. Although a small number of tanks were delivered, and some training undertaken, the end of the war against Japan meant that the conversion was not completed. At the end of September, the 254th Indian Tank Brigade was re-assigned and posted away from Ahmednagar. All the Churchills delivered up to that point were returned to the Ordnance Depot at Kirkee (Khadki) by the end of November-early December 1945. Of the three regiments (battalions) involved, the 3rd Dragoon Guards accompanied the 254th Brigade when posted away while the 149th Regiment Royal Armoured Corps and the 150th Regiment Royal Armoured Corps were eventually disbanded at Ahmednagar on 28th February 1946, the majority of personnel already having been repatriated to the United Kingdom or posted to other units.Other theatres
In mid-1944, at the request of Britain's War Office, the Churchill was tested by the Australian Army, along with the M4 Sherman. The results were to be used to determine any modifications required for use in the tropics; Matildas were used as a reference point in the tests at Madang, New Guinea. The Churchill was found to be, overall, superior to the other tanks for jungle warfare. It was not used in the Pacific War; only 46 of the 510 Churchills ordered by Australia were delivered by the end of the war, and the remainder of the order was cancelled.USSR Service
The Soviet Union was sent a total of 344 Churchill Mk III and Mk IV types as part of the Lend-Lease programme. 91 were lost en route on the Arctic Convoys. In 1942-1943, used Churchills in the Battle of Stalingrad (47th and 48th regiments of heavy tanks - 42 Churchills). In 1943, the Soviet 5th Guards Tank Army used Churchills in the Battle of Prokhorovka (15th and 36th regiments of heavy tanks - 42 Churchills) during the Battle of Kursk, and in the Fourth Battle of Kharkov. And other battles until 1944 (82th regiment of heavy tanks).Irish Army Service
The Irish Army took delivery of three Churchill Mk VI tanks in 1948 and a fourth in 1949. They were rented from the British War Office as trials vehicles until 1954, when they were purchased outright. This purchase was despite the fact that the supply and transport corps workshops, which maintained them, had reported that spares had all but run out. Experiments were carried out involving replacing the existing Bedford engine with a Rolls-Royce Merlin engine salvaged from an Irish Air Corps Seafire aircraft. The experiment was not a success, although the reasons are not recorded. By 1967, only one Churchill remained serviceable, and by 1969 all were retired. One remains preserved in the Curragh Camp.Korean War
In late 1950, a Churchill Crocodile squadron (C squadron, 7 Royal Tank Regiment) was sent to Korea. In action against the Chinese, they mostly fought as gun tanks, for example in the Third Battle of Seoul. To restore 1st Battalion, Royal Northumberland Fusiliers' position during the defence of Seoul, Brigadier Thomas Brodie of the 29th Infantry Brigade sent four Churchill tanks as reinforcement, and their contributions to the battle was widely praised by British and American historians. These were the last use of the Churchill in action by the British. The tank remained in the service of the British Army until 1952 with one, a bridge-layer, remaining in service well into the 1970s.Variants
* ^ Churchill I (303 produced) - Equipped with a 40mm 2 pounder gun in the turret with 150 rounds, and a coaxial Besa machine gun. There was a 3 inch howitzer in the hull, with 58 rounds, for use against infantry. It was a tank that was noted for poor mechanical reliability. It was the main tank issued to the Canadian forces at Dieppe. It was used in Tunisia and some were still in use late in the war in Italy on the Gothic Line.
* Churchill Mk II (1,127 produced) - Replaced the hull howitzer with another machine gun to reduce cost and complexity. Sometimes referred to as "Churchill Ia".
* Churchill Mk IICS (Close Support) - Placed the 2 pounder gun in the hull and the howitzer in the turret, available in very limited numbers. Sometimes called the "Churchill II". Not used in combat.
* ^ Churchill Mk III (675 produced) - The III was the first major armament overhaul of the series, eliminating the hull howitzer and equipping the tank with a more powerful 6 pounder gun with 84 rounds. It had a new "cleaner" squarish turret, which, unlike earlier versions, was welded. The first Mark to have "catwalks" over the upper track runs to protect the tracks.
* Churchill Mk IV (1,622 produced) - The IV was the most numerous Churchill produced, and was virtually identical to the III, the largest change being a return to the less costly cast turret; however, the turret's "clean" squarish shape remained. In earlier models, turrets using the 6 pounder Mark V were fitted with a counterweight. Some were refitted with American 75mm guns from Sherman tanks while others were up-gunned with British 75mm guns, creating the Mark IV (75). The QF 75mm and the 6 pounder can be differentiated by the presence of a muzzle brake - the 6 pounder did not use a muzzle brake, while the QF 75mm did.
* Churchill Mk V (241 produced) - A Churchill equipped with a close support 95mm howitzer with 47 rounds in place of the main gun in a cast turret. The turret was similar, but not identical, to the Marks IV/VI turrets, with a slightly different opening for the gun in the turret front face.
* ^ Churchill Mk VI (200 produced) - Along with several minor improvements, such as an additional collar at the turret base protecting the turret race, it was produced as standard with the 75mm Mark V gun. Few were built due to the impending release of the VII and concurrent upgunning of the Marks III/IV.
* ^ Churchill Mk VII (A22F) (1,600 produced, together with Mark VIII) - The second major redesign from previous models, the VII used the 75mm gun, was wider, and carried much more armour, 50% thicker at the front than a Tiger I, giving it the ability to withstand massive amounts of punishment. It is sometimes called the Heavy Churchill and was re-designated as the "A42" in 1945. This version of the Churchill first saw service in the Battle of Normandy, and in total served with three Royal Armoured Corps regiments in western Europe, one in Italy and with 7th Royal Tank Regiment in Korea. The Mark VII was designed to be able to be converted into the Crocodile flame-throwing variant without major modification.
* ^ Churchill Mk VIII (1,600 produced, together with Mark VII) - A Churchill VII which replaced the main gun with a 95mm howitzer with 47 rounds in a slightly different turret.
* Churchill Mk IX - Churchill III / IV upgraded with extra armour added to hull and turret, along with gearbox and suspension modifications. If the original turret was retained without added armour it was designated LT ("Light Turret").
* Churchill Mk X - The same improvements as for the IX applied to a Mk VI.
* Churchill Mk XI - The same improvements as for the IX applied to a MkV CS.
* Churchill NA75 (200 produced) - Churchill IVs with 6 pounder guns replaced (under Operation Whitehot) by 75 mm guns and mantlets from destroyed or scrapped Sherman tanks, fitted to Churchill IV cast turrets. Their performance was virtually identical to the VI. They were known as NA 75 from 'North Africa' where the first conversions took place, after 48 Shermans with otherwise new guns had been disabled by mines. Some Mark IIIs were also modified, using Mark IV turrets. To fit the Sherman mantlet required cutting away the front of the Churchill turret before it was welded in place, then the mantlet slot had to be cut away to give sufficient elevation. The Sherman 75 mm gun was designed for a left hand loader and the Churchill, in common with British practice, had a right hand loader. The gun was therefore turned upside down and the firing controls adapted. The conversion of about 200 tanks was carried out between March to June 1944 and the conversion project earned the officer in charge, Capt. Percy Morrell, an MBE as well as a promotion.Specialist Vehicles
* Churchill Oke - A Churchill II or III with a flamethrower. The Oke flamethrowing tank was named after its designer, Major J.M. Oke. The design was basically for a Churchill tank fitted with the Ronson flamethrower equipment. A tank containing the flame fuel was fitted at the rear, with a pipe from it leading to the fixed angle mounting on the front hull to the left, leaving the hull machine gun unobstructed. There were three (named "Boar", "Beetle" and "Bull") present, in the first wave, at Dieppe; these were quickly lost and abandoned.
* ^ Churchill ARVE - Proposed by a Canadian engineer as a result of experience from the Dieppe Raid, the Assault Vehicle Royal Engineers was a Churchill Mark III or IV equipped with the "Mortar, Recoiling Spigot, Mark II" (or Petard), a 290 mm (11 in) spigot mortar which throws the 40 lb (18 kg) "Flying dustbin" demolition bomb with a 28-pound high-explosive warhead. The Petard, developed by MD1, was designed for the quick levelling of fortifications. The Petard was reloaded by traversing the turret to point front, slightly to the left, with the barrel directly over the co-driver's sliding hatch. The regular two piece co-driver's hatch was plated over, and a small sliding hatch was installed to allow access to the Petard. The Petard barrel would then be' broken' vertically, and the co-driver would slide open his hatch. The co-driver would then push the projectile into the barrel. The barrel would then be closed, the Petard traversed back down, and the turret rotated back to its original position. The co-driver's hands were briefly exposed during the process.
The AVRE could also be equipped with numerous other attachments, such as the Small Box Girder bridge, which was carried at the front of the tank and laid across ditches or narrow rivers up to 30 feet wide, and the Canadian Indestructible Roller Device (CIRD), which was used to protect the tracks of a tank from mines. It could also carry fascines, which are large bundles of wood carried on the front of the tank and dropped into trenches to help the Churchill cross over them, devices to place explosive charges against obstacles, and 'Bobbin's, which are massive rolls of canvas in drums, that were unrolled in front of the Churchill to help it over soft terrain. They were used during the invasion of Normandy to help the Churchill over soft sand and also served to leave a trackway for following vehicles.
By the time of the invasion of France in June 1944, 180 AVREs had been converted. They were first deployed in Normandy by the 79th Armoured Division on D-Day. They were extremely successful and served until the end of the war. A further 574 followed. While the driver came from the Royal Armoured Corps, the five other crew were drawn from the Royal Engineers. One of the RE crew was a demolitions NCO sapper responsible for priming the "Flying dustbin" and who led the crew when they dismounted from the tank to place demolition charges ("Wade" charges).
Other versions that did not see active service were equipped with anti-mine ploughs, mine rollers, or special demolition charges to destroy reinforced concrete walls.
Post-war, new Churchill AVREs were developed on the basis of a modified Churchill Mk VII armed with a breech-loading low velocity 165mm demolition gun that fired a HESH round with about 40 lb (18 kg) of C4 explosive. The nomenclature of the AVRE was later changed to Armoured Vehicle Royal Engineers.
* Churchill ARV Mk I (Armoured Recovery Vehicle) – A turretless Mk I with a jib that could be fitted at front or rear. Production began in early 1942.
* ^ Churchill ARV Mk II – A Churchill Mark III or Mark IV with a fixed turret/superstructure with a dummy gun. It was equipped for recovering other tanks from the battlefield. Mounted a front jib with a 7.5 ton capacity, a rear jib rated for 15 ton and winch that could pull 25 tons. With just a 3-man crew, there was enough room to carry the crew of the tank being recovered. Armament was single Besa machine gun.
* Churchill ARK Mk I (Armoured Ramp Carrier) - The Armoured Ramp Carrier was a turretless Churchill with ramps at either end and trackways along the body to form a mobile bridge. Fifty of these were built on Mark II and Mark IV Churchills. The Link Ark or Twin Ark was two ARKs used side-by-side to give a wide crossing. The ramps on these were folding types giving a longer, 65 ft (20 m), crossing. The Twin-ARK was used for the post-war Conqueror heavy tank.
* ^ Churchill ARK Mk II had a wider, 4 ft (1.2 m) instead of the usual 2 ft (0.61 m), trackway on the left hand side so narrower vehicles could also use the ARK. These were conversions of the Ark Mark I in mid-1944. The "Italian Pattern" Ark Mk II ( initially called "Octopus") was produced in Italy using US ramps on Churchill Mk III chassis and did not have trackways on the tank itself (vehicles drove on the tank's tracks). "Lakeman Ark" was an experimental design for attacking very high obstacles. It was a turreted Churchill with the trackways built above the height of the turret, and long ramps at the rear.
* ^ Churchill Bridgelayer - The British already had experience of bridge-laying tanks with the Valentine and Covenanter and began work on a Churchill-based bridge-layer in 1942. The bridge ("Tank, 30ft, No.2 "), which could support a weight of 60 tons, was carried on top of the tank. When the obstacle was reached, an arm (driven by hydraulics in the tank) pivoted at the front of the tank and placed the bridge in position. Other bridges could be deployed by the Churchill. "Skid Bailey" was a bridge formed from Bailey Bridge parts on skids that was moved into position by two Churchill AVREs – one pulling and one pushing. "Mobile Bailey Bridge" was a complete bridge on unpowered track units; it was pushed into position by two AVREs. Similarly, a bridge could be rested on an AVRE with its turret removed while a second AVRE pushed.
* ^ Churchill Crocodile - The Churchill Crocodile was a Churchill VII that was converted by replacing the hull machine gun with a flamethrower. The fuel was in an armoured wheeled trailer towed behind. It could fire several one second bursts over 150 yards. The Crocodile was one of "Hobart's Funnies" – another vehicle used by the 79th Armoured Division. A working example can still be seen at the Cobbaton Combat Collection in North Devon.
* ^ Gun Carrier, 3-inch, Mk I, Churchill (A22D) - Coming out of a General Staff request in 1941 to investigate fitting high velocity guns on tanks. Neither the Churchill nor Valentine could mount a turret with a high velocity gun larger than the 6 pounder, but it was proposed that a fixed superstructure could carry a larger gun with limited traverse. Vauxhall was provided with 100 guns and given the task of producing the vehicle. The pilot vehicles were ready for testing in early 1942 and found to be satisfactory, but progress with the 17 pounder Challenger cruiser tank and refocussing on a general purpose role (and 75mm gun) for the Churchill led to a reduced order. A fixed 88 mm (3.5 in) thick superstructure with the gun in a ball mount was installed on the chassis of a Churchill. The gun was an otherwise obsolete 3 inch 20 cwt anti-aircraft gun. Fifty were built in 1942, but none are known to have been used in combat as the 17 pounder anti-tank gun gave the British the necessary firepower. Some were adapted for experimentation and training with the "Snake" mine-clearing line charge device.
* Churchill Flail FV3902 or Toad - A 1950s mine-clearing flail tank built on a Churchill chassis using a Rolls-Royce Meteor engine to drive the flails.
* Churchill Goat - A chargelayer, like the Double Onion device.
* Churchill Great Eastern Ramp - A much larger longer and higher trackway ramp than the ARK for crossing 60 ft (18 m). The 25-foot-long front ramps were launched into position with rockets. Ten built and two delivered in 1945 but not used in action.
* ^ Churchill Kangaroo - The Churchill Kangaroo was a turretless Churchill hull converted to an armoured personnel carrier.
* Black Prince - In 1943, an attempt was made to produce a 17 pounder armed tank on the Churchill chassis. It was known that sufficient numbers of the 17 pounder Challenger cruiser were not going to be produced in time for the invasion of Europe, and work was only starting on the Centurion cruiser design. Due to the wider turret required, Vauxhall had to redesign the hull though it used as much of the Churchill Mark VII as possible. This resulted in the Tank, Infantry, Black Prince (A43). Six prototypes were built and delivered in May 1945 just as the war in Europe was ending. The test programme was completed but the project was cancelled due to the success of the new and less complicated Centurion Mark I which offered the same armament and frontal armour, was faster and more manoeuvrable, and had just entered production.Surviving Vehicles (UK)
The Churchill Trust is a project that aims to restore existing Churchills to their original condition and working order. So far, a Mark III AVRE with appliqué armour, salvaged from a firing range, and a post-war Mark IV Twin-ARK have been restored to running conditions. The specialist equipment were removed and turrets were added, converting both tanks into their original variants. The project is currently in the process of restoring a Mark VII AVRE that was recovered from a range in northern England
The Tank Museum in Bovington Camp, Dorset, England, currently has three Churchills in its collection: a Mark VII as a static indoors display, a working Mark III AVRE as a static display, which is brought out during events for tank parades, and a Mark I as an outdoor static display. The museum's Mark VII was the last Mark VII produced; it went directly to the museum from the factory, and in terms of mileage, is virtually brand new. The Mark III AVRE was salvaged from a firing range marker as a complete wreck. It was restored to running order by Bob Grundy of Wigan and his Tracked Armour Group in August 1988.SpecificationsDesigner:
Harland and Wolff (A20), Vauxhall Motors (A22)Manufacturer:
1941 to 1945No. built:
39.1 t (38.5 long tons) (Mark I), 40.7 t (40.1 long tons) (Mark VII)Length:
24 ft 5 in (7.44 m)Width:
10 ft 8 in (3.25 m)Height:
8 ft 2 in (2.49 m)
Crew: 5 (commander, gunner, loader/radio operator, driver, co-driver/hull gunner)Armour:
For Churchill I-VI: 102 mm hull front, 89 mm hull side, 51 mm hull rear, 89 mm turret front, 76 mm turret side and rear. Mark VII-VIII - 152 mm hull and turret front, 95 mm hull sides and turret sides and rear, 51 mm hull rear.Main armament:
QF 2 pounder (Mark I and II), QF 6 pounder (Mark III and IV), QF 75mm (Mark VI and VII), QF 95mm (Mark V and VIII).Secondary armament:
Two 7.92mm Besa machine guns and 3 inch howitzer (Mark I).Engine:
Bedford 12-cylinder, 4 stroke, water-cooled, horizontally opposed, L-head petrol engine, 350 hp (261 kW) at 2,200 rpmPower/weight:
9.1 hp (6.7 kW) / tonneTransmission:
Merritt-Brown 4-speed constant-mesh epicyclic gearboxSuspension:
Coiled springOperational range:
56 miles (90 km)Speed:
15 mph (24 km/h)Steering system:
Triple differential steering in gearbox