Photograph - 'German Prisoners from Messines at St. Omer'; France; Sergeant John Lord; World War I; 1916-1917; Black and white photograph which shows a large group of German prisoners of war; captured at the Battle of Messines; being marched through St Omer. During World War I St Omer was used as the British Royal Flying Corps Headquarters and as a result; a transit camp for most British flight squadrons. 7;000 German prisoners of war were captured at the Battle of Messines.