This fascinating book tells the forgotten story of four to five thousand British civilians who were interned at the Ruhleben camp near Berlin during the First World War and formed a unique community in the heart of enemy territory. The civilians included academics, musicians, businessmen, seamen and even tourists who had been in Germany for only a few days when war broke out. This book takes a fresh look at German internment policies within an international context, using Ruhleben camp as a particular example to illustrate broader themes includeing the background to the German decision to intern 'enemy aliens'; Ruhleben as a 'community at war'; the role of civilian internment in wartime diplomacy and propaganda; and the place of Ruhleben in British memory of the war. This study will be of interest to all scholars working on the First World War, and to all those concerned with the broader impact of modern conflicts on national identities and community formation.