Isle of Man. (Internment Camp Mail). 1916. Envelope printed 'Prisoners of War' written from 'Camp 2. Compound 3, Section 4 B, Knockaloe Camp Peel, Isle of Man' addressed to London bearing Great Britain SG 357, 1d scarlet tied by 'The Camp, Knockaloe/ Peel' double ring '2nd Sep 16' with faint oval 'Aliens Detention Camp/ Knockaloe. I.O.M./ Censored' in violet on face.