This primary source comes from the Records of the War Department General and Special Staffs.
Full Citation: 165-BO-1688; A communication trench at Arras, France. 1917; 1917; British Photographs of World War I, 1914–1918; Records of the War Department General and Special Staffs, Record Group 165; National Archives at College Park, College Park, MD. [Online Version, https://www.docsteach.org/documents/document/a-communication-trench-at-arras-france-1917, March 27, 2025]