The German armies of World War II were mostly composed of traditional infantry divisions, not Panzer units, and much of the credit for dramatic success of the Wehrmacht in 1939–40 has to go to the foot soldiers. One reason for the exceptional tactical performance of German infantry in these years was the MG34. It was the best light machine gun of its time, and German formations had plenty of them: 1 per infantry squad and 378 per infantry division in 1939. Other armies generally relied on automatic rifles or magazine-fed light machine guns for squad-level firepower, leaving them at a significant disadvantage against German infantry.