Covenanter tank
The Cruiser tank Mk V or A13 Mk III Covenanter was a British cruiser tank of the Second World War. The Covenanter was the first cruiser tank design to be given a name. Designed by the London, Midland and Scottish Railway as a better-armoured replacement for the Cruiser Mark IV, it was ordered into production in 1939 before pilot models were built. Problems with the design became apparent only after production was under way.
The tank equipped various British armoured divisions in the home defence and training roles. It never left the British Isles as poor engine cooling caused versions MkI-MkIII to be declared unfit for overseas service especially in hot climates. This was rectified in the MkIV after many corrective actions were undertaken but, by February 1944, it was declared obsolete. More than 1,700 of the type were built.
It was named after the Covenanters, a Scottish religious faction in the British Isles at the time of the Wars of the Three Kingdoms.
Development
In 1938, the War Office had issued a requirement for a new, better armoured "heavy" cruiser tank to replace the Cruiser IV. Nuffield's A16 design was found to be too expensive and, in 1939, a cheaper and lighter cruiser tank – under General Staff specification A13 Mk III Cruiser Mark V – was chosen to be developed. It had nothing apart from Christie suspension and armament in common with the other A13 specifications.The initial specification required a QF 2 pounder gun, at least one machine gun, the same A13 Christie suspension in a lower hull, epicyclic steering transmission and "armour standard" of. The "30 mm armoured standard" referred to any vertical plate having to be 30 mm thick. Angled surfaces could be thinner, provided they were at least as effective as a 30 mm thick vertical plate.
From these, a design using many sloped surfaces was chosen to keep the weight low. To keep the silhouette low, the suspension used cranked arms and a low profile engine was envisaged. The engine, which was to be specifically designed for it, was to deliver at least. The Wilson transmission and steering of the A16 would be used.
Design work was by the London, Midland and Scottish Railway Company, who had no prior experience in the design and production of fighting vehicles. and had been invited to participate under a Government policy that British companies should develop necessary skills in expectation of war. The design assumed a welded hull rather than the usual rivetting. The turret was designed by Nuffield, with Henry Meadows designing a new low profile engine for it. On 17 April 1939, before even a single prototype was produced, the first 100 vehicles were ordered from the LMS. Additional orders soon followed, with English Electric and Leyland Motors joining the production effort, for a final production total of 1,771 Covenanters. Nuffield was also approached, but preferred to design its own offspring of the A13 line, which became the Cruiser Mk.VI Crusader.
Due to the expectations of an imminent war, the design was ordered "off the drawing board". The expectation was that two pilot models would serve for testing and results applied to the production lines.
To meet the engine requirement, a horizontally opposed 12-cylinder design was used. Although flat, it was wide and left no room for radiators in the engine compartment, and so the radiators were situated at the front of the vehicle. The unusual arrangement, although tested in mockup form first, when combined with the rushed design process resulted in serious problems with engine cooling. Even when the systems were redesigned, there were problems, and the piping from engine to the radiators heated the fighting compartment. These problems meant that the Covenanter would not be employed in the North African Campaign. Instead, Crusader and American tanks were sent to Africa, while the Covenanters remained in the British Isles.
LMS advised a return to riveted construction due to doubts about the strength of the welds, and rather than risk delays due to a lack of welders, this was accepted. The welded design used two layers of armour plate, the inner being of steel that would weld readily without losing its properties. This two-plate system was retained when the design reverted to riveted construction. The use of riveted construction, the use of steel wheels instead of the intended aluminium and an increase in armour specification to at the front of hull and turret increased the weight to a level where the tank suspension was at maximum load, leaving no room for later development of the design.
A further change was made to the transmission. Rather than risk the availability of the combined Wilson transmission and steering affecting production, the A13 "crash" gear box was used with epicyclic steering units. This necessitated a reduced size of cooling fan for the transmission compartment.
The contracts were placed with the manufacturers in 1939. The pilot model was tested with a favourable outcome in 1940; though the second pilot had cooling issues. The first deliveries of production vehicles were not until after the battle of Dunkirk. Production of turrets lagged behind that of hulls. Although the Covenanter was needed at the time, production continued even when newer better tank designs were waiting for space on production lines.
By late 1943, the Covenanter was considered too weakly armed and armoured to deal with new German tanks. It was decided that neither problem could be addressed without significant changes in the design, so the tank was declared obsolete and all vehicles except the bridgelayer variant were to be scrapped.
Service
Except for a few trial vehicles, Covenanters were never deployed outside the British Isles. The Covenanter was used to re-equip the British 1st Armoured Division, which had lost most of its tanks in the Fall of France. When the 1st was sent to Egypt, the tanks were transferred to the 9th Armoured Division.Eventually, a handful of vehicles were sent to the desert for service trials and were allocated to the REME for maintenance and evaluation. It is not clear if these tanks were ever used in combat, although the unit markings indicate they may have been deployed alongside Kingforce with their new 6 pounder-equipped Churchill Mk III tanks.
Covenanters were also used to equip the Guards Armoured Division in 1942 and elements of the 1st Polish Armoured Division when it was formed in the UK; they were replaced before these units were sent to the front-line, except for a few bridgelayers that both divisions retained and used in their advance through Belgium and the Netherlands.
Observation Post tanks were issued to artillery units to carry Forward Observation Officers for Royal Artillery batteries. In an armoured division, there were two OP tanks for each RHA or field battery. Medium gun batteries had just one. Command tanks were similar to OP tanks, but had only two No. 19 sets; one on the regiment radio net and the other on the brigade net.
Covenanter bridgelayers were used by the 1st Czechoslovak Armoured Brigade during the siege of Dunkirk from October 1944 to May 1945. The bridgelayer version was also used by the 4th Armoured Brigade of the Australian Army at Bougainville and Balikpapan during the Pacific Campaign in 1945.
Variants
- Covenanter Mk I – Original production model.
- * Covenanter Mk I Close Support – Armed with 3-inch howitzer.
- Covenanter Mk II – Mark I production modified by addition of radiator-mounted oil cooler.
- * Covenanter Mk II CS – Armed with 3-inch howitzer.
- * Observation Post version existed with dummy gun, two No. 19 radios and a No. 18 radio; issued to artillery units.
- * Command version existed with dummy gun and two No. 19 radios.
- Covenanter Mk III – new production with twin oil coolers installed either side of the engine. Clutch linkage modified. Air cleaners added inboard at the rear. Exhaust silencers moved to the ends of the track guards.
- * Covenanter Mk III CS – Armed with 3-inch howitzer.
- Covenanter Mk IV – New production as the Mk II with the clutch changes of the Mk III.
- * Covenanter Mk IV CS – Armed with 3-inch howitzer.
- * Observation Post version existed with dummy gun, two No. 19 radios and No. 18 radio.
- Covenanter Bridgelayer – Covenanter hull fitted with a vehicle-launched bridge. This was long and wide. It could span a gap and was capable of carrying 24 tons. In 1944, an improved bridge was developed with a 30-ton capacity.
- Covenanter ARV Mk I – Armoured recovery vehicle based on turretless Covenanter hull. One prototype was built in 1942.
- Anti-Mine Roller Attachment Mk IC – a mine clearing device consisting of four heavy rollers suspended from a frame. The weight of the rollers could be increased by filling them with water or sand.
Surviving vehicles
A second Covenanter tank was recovered in May 2017 from the same farm, now the site of Denbies vineyard.
The partially buried, wrecked hulls of two other tanks may be seen at Titchwell Marsh in Norfolk, UK. Now a Royal Society for the Protection of Birds nature reserve, the area was formerly a tank gunnery range and the Covenanters were likely used as targets.
Two Covenanter Bridgelayers are preserved in Australia – one at the Royal Australian Armoured Corps Tank Museum, Puckapunyal, Victoria, and one at the 1st/15th Royal New South Wales Lancers Lancer Barracks and Museum at Parramatta, New South Wales.