Prisoner of war mail: 1916, letter from Germany with foreign censorship Emmerich and British censorship P. C. Post FREE Prisoners of War in red to Windhoek, due to before removed German franking there with 2 and 3 d postage stamps added and with cancellation adjusted railway mail oval cancel -WINDHOEK 10.4.16 forwarded, Unnoticed More unavoidable traces very meaningful piece