In this episode, we explore the logistics of World War II and how industrial capacity, transportation networks, fuel, and supply systems became decisive weapons in their own right. From the older military practice of armies living off the land to the vast mechanized supply chains of the twentieth century, we examine how logistics connected national economies to forces fighting across multiple continents. Particular attention is given to the United States, whose enormous industrial mobilization, oil resources, workforce, and relative geographic security helped transform the country into Roosevelt’s “Arsenal of Democracy,” supplying Allied armies with unprecedented quantities of vehicles, ammunition, food, equipment, and fuel. The episode also contrasts this logistical strength with the severe resource and energy constraints faced by the Axis powers, revealing why the ability to manufacture, transport, maintain, and continuously replenish military forces was as fundamental to victory as strategy and battlefield tactics.