In the wake of World War I, the German army lay in ruins—defeated in the war, sundered by domestic upheaval, and punished by the Treaty of Versailles. A mere twenty years later, Germany possessed one of the finest military machines in the world, capable of launching a stunning blitzkrieg attack against Poland in 1939. Well-known military historian Robert M. Citino shows how Germany accomplished this astonishing reversal and developed the doctrine, tactics, and technologies that its military would use to devastating effect in World War II.