On September 1, 1939, Adolph Hitler inaugurated a new style of warfare-blitzkrieg-that terrorized Europe for half a decade. This "lightning war" provoked panic in millions and led to the downfall of entire nations: Poland, Denmark, Norway, Belgium, Holland and, one of the greatest military powers of the day, France. By summer of 1940, Hitler's triumphant blitzkrieg cam-paigns gave his armies a veneer of invincibility. Yet, the German strongman had...