High Quality Content by WIKIPEDIA articles! The Infantry Tank Mark II (sometimes referred to as Matilda II, Matilda senior, by General Staff Specification A12, or simply an `I` tank) was a British infantry tank of the Second World War. It served from the start of the war to its end and became particularly associated with the North Africa Campaign. It was replaced in service by the Infantry Tank Mk III Valentine. With its heavy armour the Matilda II was an excellent infantry support tank, but with somewhat limited speed and armament.