MI9, the British Directorate of Military Intelligence Section 9, was a department of the War Office between 1939 and 1945. During World War II it was tasked with facilitating escapes of British prisoners of war and the return of those who succeeded in evading capture in enemy occupied territory (for example, aircrew who had been shot down and soldiers stranded after the Battle of Dunkirk). It also communicated with British prisoners of war and sent them advice and equipment.
MI9 officially came into being on 23 December 1939, by Major (later Brigadier) Norman Crockatt, formerly of The Royal Scots (The Royal Regiment). In December 1941, MI9 became a separate department, MI19. At first MI9 was located in Room 424 of the Metropole Hotel, Northumberland Avenue, London. It received little financial support and was understaffed due to power struggles and personality clashes with MI6 (whose assistant-head was Colonel Sir Claude Dansey, known as ACSS) and other outfits such as Special Operations Executive (SOE) and Political Warfare Executive (PWE).
With limited space at the Metropole, a floor was also taken at the requisitioned Great Central Hotel, opposite Marylebone station, where World War II prison-camp escapees were debriefed and questioned about their journey home. Later MI9 moved to Wilton Park, Beaconsfield, Buckinghamshire.