Fourth Army area administrative map : situation map showing approximate position of British Front Line on 31st May, 1917
Series Number Id: UNKNOWN. Sheet number: parts of sheet 57 and 62. Fourth Army situation map, German retirement and Hindenburg Line, 31 May 1917. Portion of title lacking due to cropped right extent of map sheet. "4th Field Survey Coy, R.E. (1475)." Grey detail and squaring; blue water; black overprint. Key to explosions and fires in black overprint. Many fires and an explosion shown in St Quentin. Main German defence lines shown in black, including Le Catelet - Nauroy Line, Beaurevoir Line, and Walincourt - Audigny Line., Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC19; envelope_number: 581.