The film opens with the statement: "The German invasion of Britain took place in 1940 after the retreat from Dunkirk." After months of fierce resistance and brutal reprisals, the occupying forces manage to restore order, largely suppressing the resistance movement. However, due to demands from the Ural Mountains front, most German troops are eventually removed from Western Europe, and the garrisoning of Britain is largely carried out by local volunteers to the German army and the SS.