History
In 1936 the British War Office designated two different kinds of tanks for future development: heavily armoured infantry tanks to be used in close co-operation with infantry during attacks, and fast mobile cruiser tanks designed to make forays deep into enemy territory.
In 1934 Sir John Carden of Vickers-Armstrong produced new medium tank, the A9, which was subsequently accepted as an interim design for limited production as the Cruiser Tank Mark I. It was expected to be replaced by a Christie suspension design. In 1937-1938, 125 examples of the A9 were produced. The A9 was lightly armoured but capable of 25 mph and carried a QF 2pdr (40mm) gun that was effective against current tanks.
At the same time as the A9, the A10, was also designed by Carden for use as an infantry tank. Built on basically the same design but with added armour plate to give 30 mm of protection. It was realised that it was insufficiently armoured for the role. Under "heavy cruiser" designation, it was put into production in July 1938 as another interim design. It had the same armament as the A9 and was the first to be equipped with the Besa machine gun. A total of 175 Mk IIs were produced by September 1940.
Combat experience of the A9 during the Battle of France in 1940 was to reveal several shortcomings, including inadequate armour and a lack of space for the crew, but it nevertheless saw useful service in the Western desert in 1941. The A10 saw action in France, North Africa and Greece.
Orders for the Mk I and Mk II Cruisers were restricted, since the British Army had decided to produce a more advanced and faster cruiser tank which would incorporate the Christie suspension designed by American inventor J. Walter Christie and have better armour.
In 1936, General Martel, a pioneer in tank design who had published works on armoured warfare and pioneered the lightly armoured "tankette" to enhance infantry mobility, became Assistant Director of Mechanization at the War Office. Later that year Martel witnessed demonstrations of Soviet tank designs including the BT tank, which had been influenced by Christie's work. He urged the adoption of a tank that would use the suspension system and also follow Christie's practice of using a lightweight aircraft engine such as the Liberty Engine or a Napier Lion. The government authorized purchase and licencing of a Christie design via the Nuffield Organization.
The tank was very rudimentary and too small for British use, but the suspension was very effective and this became the basis of the Cruiser Mk III (A13). Following testing of two prototypes, the A13 was ordered into production and a total of 65 were manufactured. The Mk III weighed 31,400 pounds (14,200 kg), had a crew of 4, a 340 hp engine which gave a top speed of 30 miles per hour (48 km/h) and was armed with a 2 pounder gun and a machine gun. However, when it was introduced into service in 1937, the Army still lacked a formal tank division.
The Cruiser Mk IV (A13 Mk II) was a more heavily armoured version of the Mk III.
Read more about this topic: Cruiser Tank
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