The Infantry Tank Mark II (sometimes referred to as Matilda II, Matilda senior, by General Staff Specification A12, Waltzing Matilda, 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.
The Red Army received 918 of the 1,084 Matildas sent to the USSR. The Soviet Matildas saw action as early as the Battle of Moscow and became fairly common during 1942. Unsurprisingly, the tank was found to be too slow and unreliable. Crews often complained that snow and dirt were accumulating behind the "skirt" panels, clogging the suspension. The slowness and heavy armour made them comparable to the Red Army's KV-1 heavy tanks, but the Matilda had nowhere near the firepower of the KV. Most Soviet Matildas were expended during 1942 but a few served on as late as 1944. The Soviets modified the tanks with the addition of sections of steel welded to the tracks to give better grip.