Cruiser Mk IV
|Tank, Cruiser, Mk IV (A13 Mk II)|
|Place of origin||United Kingdom|
|Weight||14.75 Long tons|
|Length||19 ft 9 in (6.02 m)|
|Width||8 ft 4 in (2.54 m)|
|Height||8 ft 6 in (2.59 m)|
|Crew||4 (commander, gunner, loader, driver)|
|Armour||6 - 30 mm|
|QF 2-pdr gun
|0.303 in Vickers machine gun
|Engine||Nuffield Liberty V12 petrol
340 hp (250 kW)
|90 mi (140 km)|
|Speed||30 mph (48 km/h)
off road: 14 mph (23 km/h)
The Tank, Cruiser, Mk IV (A13 Mk II) was a British cruiser tank of the Second World War. It followed directly on from the Tank, Cruiser, Mk III (A13 Mk I). The first Mk IVs were Mk IIIs with extra armour fitted to the turret. Later Mk IVAs were built with the complete extra armour. The tank was used in France in 1940 and in the early part of the war in North Africa, before being withdrawn from service.
Design and development
Britain became interested in fast tanks after observing the Soviet BT tanks during the 1936 Red Army manoeuvres. The BT was based on the revolutionary designs of American J. Walter Christie, and so a team from Morris Motors was sent to the United States to purchase one of Christie's tanks, and also the rights to build more. The tank purchased became known as the A13E1, and this was delivered in late 1936. However, the hull was too small and this led to a second British-built prototype being constructed.
The A13E2 was built to mount the turret of the Vickers designed Cruiser Tank MkI (A9). This carried a 40 mm Ordnance QF 2-pounder gun and co-axial .303 water-cooled Vickers machine gun. The drive train was also revised, with the road wheels no longer powered - as a result the tank could not be driven on its wheels alone. Better tracks were used, with rear-mounted drive sprockets and in trials, over 40 miles per hour (64 km/h) was attained on these tracks but later the speed was governed to 30 miles per hour (48 km/h). The armour basis of the A13E2 was 15 millimetres (0.59 in), in line with other pre-war fast tank designs.
The A13E3 was the final trials model; this led to the production tank, the A13 MkI, Cruiser Tank Mk III, which entered production in 1939 at Nuffield Mechanization & Aero Limited, a munitions subsidiary of Morris Motors. An order for 65 tanks was placed; and at least 30 tanks completed when the War Office decided to build a new model with thicker armour. The A13 MkII, Cruiser Tank Mk IV, had a maximum armour thickness of 30 millimetres (1.2 in), and faceted armour was mounted on the original turret's sides and rear. This gave the tank a far more modern appearance. Some Mk III tanks were re-built to Mk IV standard while at the factory.
In service, the .303 Vickers machine gun gave constant trouble, and so the British Army decided to replace it with the 7.92 mm BESA. All British tanks were to have their designs modified to mount the new weapon from early 1940. This led to the main production version, the A13 MkIIA, Cruiser Tank MkIVA. A few examples of this model were sent with the BEF to France, along with most of the earlier A13's so far produced. It is not known how many A13 MkIVA tanks were produced; numbers depending on source. Between the Cruiser Mark III and Cruiser Mark IV, 665 were produced when production ended in 1941. English Electric, Leyland and LMS Railway were also involved in A13 production.
In France the A13 did not do well; this was mainly due to poor training as a result of its being rushed into service. Many tanks shipped to France were in poor condition, some so new they had vital parts not yet installed. However, the A13 did much better in the deserts of North Africa, and coped with the conditions better than some other designs. It was fast, and it was adequately armed and armoured against Italian and German tanks of this period. It remained an effective weapon until late 1941, when newer models of the Panzer III and Panzer IV appeared with thicker armour and larger guns. In North Africa it was the anti-tank gun which claimed the vast majority of British tanks lost in battle; German tanks accounted for few British losses, contrary to popular belief 
The A13 MkIII, Cruiser Tank Mk V, was a radical departure from the original A13 design and constituted a new tank. Both hull and turret were redesigned, and it used a new flat-12 Meadows engine with radiators mounted in the front hull. The Covenanter tank was built in large numbers but suffered from chronic engine overheating, confining it to temperate-climate use and was used only for home defence and training. The A13 MkIIA was replaced by the A15 Crusader tank, which was similar to the Covenanter but used the original A13 engine.
- 65 Mk III, built 1939 by Nuffield (some converted to Mk IV)
- 225–665 Mk IV and MkIVA, built 1939–41 by Nuffield, Leyland, English Electric and LMS.
- Mk IV CS, not built
- MkV, re-design by LMS Railway as A13, Cruiser Tank MkV Covenanter
.303 Vickers machine gun replaced with 7.92 millimetres (0.312 in) Besa machine gun. MkIVA featured a new gun mantlet. Built at several factories including LMS Railway. Main type used in the desert from 1940–42.
Mk IV CS
- No Close Support Tanks were built, A9 CS was used in A13 regiments
Approximately 40 Cruiser Mk IV and MkIVA, saw service in France in 1940 with the 1st Armoured Division of the British Expeditionary Force. Most were abandoned at Calais, and the few tanks that did see action were destroyed by the numerically superior German armored forces. From October 1940 the Cruiser Tank MkIVA was sent to North Africa, where it served alongside the older A9, Cruiser Tank MkI and A10 Cruiser Tank MkII. The A13 was never available in sufficient numbers, and a typical Armoured Brigade would have a mix of slow (10–20 miles per hour (16–32 km/h)) A9 and A10 with faster (30–40 miles per hour (48–64 km/h)) A13 and Light Tank Mk VI (acting as cruiser tanks). This caused tactical and supply difficulties but the A13 was popular with its crews and its only real drawback was the lack of a high-explosive shell for the 2-pounder. In common with all cruisers it was vulnerable to standard Axis anti-tank guns, (unlike the Matilda II), which it had no way of countering except by short-range machine gun fire. The A13 was generally reliable, and the 2-pounder gun was adequate against all Axis tanks up to late 1941, when the A13 was retired. It was replaced by the A15 Crusader tank, which was in essence an enlarged A13 with thicker armour.
- Battle of France 1st Armoured Division
- Forty, George; Jack Livesy (2006). The World Encyclopedia of Tanks & Armoured Fighting Vehicles. Lorenz Books. p. 55. ISBN 978-0-7548-1741-3.
- White, BT British Tanks 1915-1945 Ian Allen p46
- Harris J. P. and Toase F. N., Armoured Warfare (London, 1990), p78
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