The successes of the German Blitzkrieg in 1939-41 were as surprising as they were swift. Scrambling to respond, Allied decision-makers' false conclusions about these tactics became myths about the Blitzkrieg that have lingered for decades. Exploring combat operations in Poland, Norway, Western Europe, and Russia, Niklas Zetterling concludes here that these grand, awe-inspiring German victories were actually sustained by the quality, flexibility, and mobility of the small combat units.