Series Number Id: UNKNOWN. Sheet number: Part of Sheet 36. Auchy-Loos Area; trench map, harassing fire and hostile batteries map, 1917. "Trenches corrected to 26-8-17." "1st Field Survey Co., R.E. 2363 [numbers crossed out and overprinted in green] 5005." German trenches and names red; British trenches and names to depth of 600 yards blue. Shows [enemy battery] positions, active and inactive, between 1-8-17 and 29-8-17 in black., WW1 Trench Map Collection: Box PC20, Envelope 642.