Tanks became a main weapon during World War II, where battles between great numbers of tanks were fought, especially between the Germans and the Soviet Union. The Battle of Kursk was the biggest. Well-known World War II tanks were the German Panzer IV, Panther and Tiger I, Soviet T-34 (produced in the largest numbers of any tank of the war and second most ever), British Matilda, Churchill and Cromwell, and American M4 Sherman (second most produced tank of the war) and Stuart tanks. There had also been plans for much larger and more heavily armoured tanks such as the Maus but these were determined to be of little use due to their huge weight, which would have made moving them very difficult, and the huge size, which would have made them easy targets for heavy artillery.