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The major tactical innovation of the war was the use of combined arms warfare, typified by the German doctrine of [[blitzkrieg]]. In this style of warfare armor, infantry, artillery and air power 9see (see [[Luftwaffe]] ) all coordinate to achieve overwhelming superiority at point on the enemy lines. Armor and fast-moving infantry units then exploit the gap and penetrate deep behind enemy lines. The objective is to cause a widespread collapse of the enemy's ability to fight. It was particularly effective during the early stages of the war, before the Allies developed effective countermeasures.