Series Number Id: UNKNOWN. Sheet number: 51a NW, NE, SW, SE (parts of). Denain area SW of Valenciennes. Gridded topographical map, compiled, drawn and printed by 1st FSB. "[1st] Field Survey Battn. R.E. 7105 [October 1918]." Detail and grid grey, water blue, contours brown, woods green. Used by infantry and artillery in the final operations in the vicinity of Valenciennes. No trenches shown., WW1 Trench Map Collection: Box PC18, Envelope 559.