During the First World War, all of the belligerent powers interned both civilian and military prisoners. In Britain alone, over one hundred thousand people were held behind barbed wire. Despite the scale of this enterprise, interment barely features in Britain's First World War memory culture. By exploring the place of prisoner-of-war camps within the “militarized environment” of the home front, this article demonstrates the centrality of internment to local wartime experiences. Forced to share the same environment, British civilians and German prisoners clashed over access to resources, roads, and the surrounding landscape. As this article contends, it was only when the British started to employ prisoners on environmental-improvement measures, such as land drainage or river clearance projects, that relations gradually improved. With the end of the war and closure of the camps, however, these deep entanglements were quickly forgotten. Instead of commemorating the complexities of the conflict, Britain's memory culture focused on more comfortable narratives; British military “sacrifice” on the Western Front quickly replaced any discussion of the internment of the “enemy” at home.