The German invasion of Poland on 1 September 1939 began World War II in Europe. The outcome of the campaign was a foregone conclusion. It pitted the newly modernized army of Europe's great industrial power against the much smaller Polish army. To further tip the scales, Germany signed a pact with the Soviet Union by which the Red Army would invade Poland two weeks after the German attack. If the outcome was predictable, its conduct was not. This book examines in detail the Polish campaign that introduced the world to a new style of warfare - Blitzkrieg.