Blitzkrieg was an operational-level military doctrine which employed mobile forces attacking with speed and surprise to prevent an enemy from organising a coherent defence.

Conceived in the years after World War I, it grew out of the earlier doctrine of "Fire and Infiltration". It was used by the German Wehrmacht in World War II. Operations early in the war—the invasions of Poland, France, and the Soviet Union—were highly effective... full article...

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