For the Germans, the truck became the secret weapon that changed warfare. From the mountain passes of the Ardennes, across the deserts of Libya and the vast wilderness of Russia, the humble truck enabled the German Army to conduct its lightning war with the speed and efficiency it required. And the key machine in Blitzkrieg was the GM Opel Blitz. This episode tells the story of the Blitz and the American-owned war factories that would produce them, putting business before country.