"The Royal Engineers Signals Service on the Western Front, 1914-1918" Royal Engineer working on a gas proof homing pigeon box, enabling messages to be attached to the pigeon without removing it from the box. Photograph taken at a German pigeon loft at the Brieftauben Station No. 708 at Roye, part of the booty of the French First Army which recaptured Roye on 27 August 1918.