M4 Sherman
The M4 Sherman was a American medium tank that served during WWII and the Korean War. The early ones had an underpowered 75 mm gun that couldn't penetrate the thick armor of the German tanks it was facing. Only the large numbers helped to knock out the heavily armored German Tigers. The early ones also had relatively thin armor that was easily penetrated by the 8.8 cm KwK 36, the anti-tank gun the Germans had.