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The IS-2 is a Soviet heavy tank, the first of the IS tank series named after the Soviet leader Joseph Stalin It was developed and saw combat during World War II, and saw service in other Soviet allied countries after the war.

The IS-2 tank first saw combat in early 1944, equipping elite Guards Heavy Tank Regiments of the Red Army. A regiment had 21 IS-2 tanks in four companies of five tanks each and one being used by the regimental commander. The special tank regiments were reserved for important attacks, often to spearhead attempts to break through fortified German positions like anti-tank defence lines and bunkers. The tanks supporting infantry in the assault by destroying bunkers, buildings, dug-in weapons and engaging German armoured vehicles. Once a breakthrough was achieved, lighter and more mobile tanks were used for exploitation and mopping-up. The IS-2 tank first saw action in Ukraine in early 1944 and claimed to have destroyed more than forty Tigers and Elefants for the loss of only eight tanks. While the German heavy tanks could knock out the IS-2, they had no real answer to its 122 mm gun, which easily outgunned them.