[Second] Army area no. 1 : Second Army lines of defence, 29th April 1918
Description
Series Number Id: UNKNOWN. Sheet number: parts of sheets 28, 29, 36. Secret, rear defence lines, April 1918. "Secret" in red overprint. "[4th] Field Survey Coy R.E. (8142) 26-1-18 [numbers stroked out with black overprint and followed with] (8729) 30-4-18." Grey base map; overprint in black and red. Rear defence lines shown in black and red., Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC19; envelope_number: 594.