Logistics, the administrative systems by which military forces are supplied, played a crucial role in the conduct of medieval warfare. This was certainly true of the royal armies dispatched by King Edward I of England (r. 1272-1307) to fight campaigns in Gascony, Flanders, Wales, and Scotland. This study focuses on the administrative and bureaucratic systems developed by the English royal government to keep tens of thousands of soldiers supplied with food, wine, and other necessities during Edward I’s wars of conquest within Britain, in Wales and Scotland.