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Tank, Cruiser, Mk I (A9)
Tank, Cruiser, Mk I (A9)
Type	Cruiser tank
Place of origin	United Kingdom
Specifications
Weight	13 tonnes
Length	5.8 m
Width	2.5 m
Height	2.65 m
Crew	6 (Commander, gunner, loader, driver, 2x MG gunners)
Armour	6 - 14 mm
Primary armament	QF 2-pdr 100 rounds
Secondary armament	3 x 0.303 Vickers MG 3,000 rounds
Engine	AEC diesel 150 hp
Power/weight	hp/tonne
Suspension	Bogie
Operational range	241 km
Speed	40 km/h

The Tank, Cruiser, Mk I (A9) was the first cruiser tank: a fast tank designed to bypass the main enemy lines and engage the enemy's lines of communication, along with enemy tanks.

Contents 1 History and specifications 2 Performance 3 Variants 4 See also 5 External links

The A9 was developed by Sir John Carden of Vickers in 1934, intended to succeed the Vickers Medium Mark II. However, this was still in the time of the Great depression and the tank had a number of cost-cutting measures applied. It was the first British tank to have a centrally-located turret. It was poorly armoured, however, with a maximum of 14 mm thickness, many faces were vertical, and there were numerous shot traps.

The driver's compartment and the fighting compartments were not separated. As well as the turret armament, which consisted of a 2-pounder (40 mm) gun and a coaxial Vickers machine gun, there were two small turrets either side of the driver's compartment, each sporting one more machine-gun. Both these smaller turrets were permanently manned, which gave the tank a total crew of 6 (Commander, gunner, loader, driver and two machine-gunners).

The tank entered testing in 1936 and 125 were ordered in the summer of 1937, 75 were built by Harland and Wolff, and the other 50 were built by Vickers. Originally a Rolls-Royce car engine was used, but this proved underpowered and was replaced by an AEC bus engine.

The later Valentine tank essentially used the same lower hull and suspension, though with considerably more armour.

The A9 weighed 12 tons, was 5.8 metres long, 2.65 metres high, 2.5 metres wide, and had a top speed of 25mph on road and 15mph off. Its maximum road range was 150 miles. The ammunition load was 100 2-pounder rounds and a total of 3,000 rounds for the three Vickers machineguns.

The Cruiser was an effective tank in the French, Greek and early North African campaigns. The 2pdr gun was perfectly capable against German tanks. However the minimal armour meant it was easily shot to pieces. Also problematic was the lack of HE shells for the 2pdr gun and even worse the lack of HE for the 95mm gun on the Close Support version.

The mechanical reliability of the Cruiser was also a disadvantage. In particular, tracks were easily slewed causing difficulties.

Mark I (A9)
Used by the 1st Armoured Division in France. Used by the 2nd and 7th Armoured Divisions in North Africa until 1941.

Mark I CS
Had a 3.7" (94mm) howitzer installed in the turret. This gun only fired smoke rounds, 40 of which were carried.

• List of AFVs

• A9 Specifications at OnWar.com
• WWIIvehicles.com