[First] Army area : [First Army artillery intelligence map, October 1917]
Series Number Id: UNKNOWN. Sheet number: part of sheet 51. Edition number: 4. In black overprint, "Confidential. Confirmed hostile guns opposite First Army Front in groups. 15-10-17. Last fortnights' numbers in brackets." "[1st] Field Survey Co., R.E. 5099" in lower margin; "[1st] Field Survey Co R.E. 5248" in black overprint near right corner of map. Grey base with blue squaring. Shows distribution and numbers of light and heavy guns, with names of groups. Covers First Army Front from north of Armentières to Arras. Stamp on reverse: 89th H.A.G. [Heavy Artillery Group] 22-10-17. Used by Major J. C. Thomson MC, OC 20th Siege Battery RGA (8-inch hows), who was also with 89ths HAG., Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC20; envelope_number: 623.