Early in World War II, Soviet tanks such as the T-34 and KV-1 had adequate firepower to defeat any of the German tanks then available. By the fall of 1942, Soviet forces began to encounter the new German Tiger tank, with armor too thick to be penetrated by the 76.2 mm guns used in the T-34 and KV tanks at a safe range.[1] The Soviet command also had reports of the Panther tank, that was in development then and possessed thicker armor than the Tiger; both represented an advance in German tank design. Although the Panther was not seen in combat until July 1943, the new generation of German vehicles meant the Red Army would need a new, more powerful main gun for their armoured formations.