[Second] Army area no. 1 : Second Army lines of defence, 25th April 1918
Series Number Id: UNKNOWN. Sheet number: . Battle of the Lys, April 1918. "Field Survey Coy R.E. (8142) 26-1-18". Grey base map; overprint in black, red, and green. "Secret" in red overprint. Shows Front Line (east of Ypres and Kemmel, west of Merville, and whole of Second Army front from Belgian area to First Army area, as far west as Saint-Omer). Corps defensive zone in green; lines of defence in black; Corps roads in red. Manuscript in top margin: G.S.O.1 (T)., Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC27; envelope_number: 794.