Series Number Id: UNKNOWN. Sheet number: parts of sheets 36 and 57. First Army Front, German order of battle, September 1918. Title in black overprint. "[1st] Field Survey Battn. R.E. 6788 [numbers crossed out with black overprint and followed with] 6911". Shows "British Line Aug. 20th" in black overprint. Grey gridded base map (enlarge 1:40,000). Shows German armies (6th and 17th), group (Corps) and divisions, army and group boundaries. Scale of miles and kilometres at foot of base map., Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC20; envelope_number: 633.