Series Number Id: GSGS 3236. Sheet number: parts of sheets 57d SE & 57c SW. [Edition A]. Battle of the Somme. "Ordnance Survey, 1916." "Trenches corrected to 6-7-16." Shows all the original German trench system before 1st July 1916, plus new trenches dug after the battle began. Detail, grid and contours grey. All trenches red (including those occupied by British). Title printed on reverse. Manuscript on reverse: V.E. Cotton Capt., D.O.T.M. 53rd Divn. 26-7-16., Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC14; envelope_number: 375.