It was every British serviceman’s duty, be he soldier, sailor or airman, to attempt to evade capture if stranded behind enemy lines or escape if captured. As there were potentially thousands of men who would find themselves cut off or captured during the Second World War, a branch of military intelligence, M.I.9, was set up in 1939 to instruct servicemen in evasion and escape techniques. Such was the success of M.I.9, and the determination and ingenuity of individuals and groups, about 35,000 Allied military personnel escaped PoW camps or evaded capture and made their way to Allied or neutral countries. How this highly secret unit was set up and organised, and how its great success was achieved, was documented by M.I.9 officers towards the end of the war – and is published here for the first time. The history includes details of the lectures given to troops on how to avoid capture if on the run in enemy occupied territory (more than 2,000 lectures were given, to over half-a-million