Sheet number: [62c NW4]. Trench / intelligence / raid map. "4th Field Survey Coy., R.E. (1178)." Area taken over by British Fourth Army from the French at the end of the Somme battle; this sector just south of the Somme river was taken over on 13 February 1917. Detail, contours & grid black; British & German trenches red. The German defense scheme shown in detail; reference shows German trenches with names, tracks, MGs, TMs, listening posts, dug-outs, headquarters. Also shown are a strong point, a defended bank, bridges over the Somme Canal and tracks across the Somme marshes. British trenches marked with section & sub-section designations along front line., Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC17; envelope_number: 521