Biache : Third Army situation and target map, 6-30 p.m., 14-5-17
Series Number Id: UNKNOWN. Sheet number: parts of squares 51b NW & NE. 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. Grey base map. Green overprint: [Enemy] Organisation. Blue overprint: approximate British Front Line; artillery details., WW1 Trench Map Collection: Box PC26, Envelope 776.