Blitzkrieg

When Germany attacked Poland on September 1, 1939, nothing like it had ever been seen before. Heralded by the insidious whine of Stuka divebombers, seven divisions of Panzers rolled across the border supported by motorized infantry.

While tanks were punching gaping holes through Polish lines and racing on at speed towards Warsaw, fleeing refugees were machine-gunned mercilessly by the Luftwaffe and...