Series Number Id: UNKNOWN. Sheet number: Part of Sheet 36. Festubert-Loos Area, trench map, enemy battery positions and target map. "Trenches corrected to 12-6-18". "Field Survey Co R.E. 5781 [numbers crossed out with black overprint and replaced with] 6405." Detail, grid and contours grey; British and German trenches and names red. In dark blue: [enemy battery] positions occupied and positions unoccupied, between 1-5-18 and 3-6-18; shows field and unknown calibre, and heavy batteries. In light blue: roads and tracks. In black: areas of activity, railways, light railways and tramways in use, dumps and headquarters. "This map is intended to serve as a guide in selecting targets for artillery and machine gun harassing fire. Current photographs should be consulted for details of work in progress.", WW1 Trench Map Collection: Box PC22, Envelope 678.