Eterpigny : Third Army situation and and target map, 6-30 p.m., 14-5-17
Series Number Id: UNKNOWN. Sheet number: parts of squares 51b NW, NE and SW, SE. Edition number: 6J. Battle of Arras, artillery intelligence: trench, artillery, situation and target map. "Special sheet." "Detail and trenches revised to 12-5-17" in red. "3rd Field Survey Co., R.E. (1566)". Grey base map. Green overprint: [Enemy] Organisation. Blue overprint: approximate British Front Line; artillery details., Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC21; envelope_number: 671.