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Due to overcrowding at Broadmoor, a branch asylum was constructed at Rampton and opened in 1912. Rampton was closed as a branch asylum at the end of 1919 and reopened as an institution for "mental defectives" rather than lunatics. During the First World War Broadmoor's block 1 was also used as a Prisoner-of-war camp, called Crowthorne War Hospital, for mentally ill German soldiers.