The A9 was also known as the Cruiser Mk I and was designed as a light, mobile tank to bypass enemy lines and engage enemy communication lines. The A9 was introduced in the inter war years and was designed by Sir John Carden of Vickers-Lloyd. It was armed with a 2 pounder and a coaxial Vickers machine gun as well as two smaller turrets on either side of the driver's compartment housing another machine gun each. This meant the tank had a crew of 6. It entered service in 1936 and 125 were produced.