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 28-6-17". "1st Field Survey Co., R.E. 2363 [numbers crossed out and replaced with blue overprint] 2364". Grey base map; German trenches and names red; British trenches and names to depth of 600 yards blue. "Map for Harassing Fire, Reference" in blue, as well as dumps, air lines, lamp signalling stations, OPs, HQs or signal stations, railways, telephone exchanges, and trench mortars. In yellow: roads in use, tracks, and centres of activity. In black: active battery positions since June 15th, positions not reported active, AA guns and zone call markings., WW1 Trench Map Collection: Box PC18, Envelope 558.
Series Number Id: UNKNOWN. Sheet number: part of sheet 51. Edition number: 1a (local). At head of map: parts of 51c S.E., 51b S.W., 57d N.E., and 57c N.W. "Special sheet". Trench map and enemy battery positions map. British trenches in red; German trenches in blue. "Trenches revised from information received to 15-8-18". "Enemy organisation 15-8-18". "Artillery, 17-8-18." British front pecked black; zone call areas black., Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC18; envelope_number: 554.
Series Number Id: GSGS 3156. Sheet number: 36, 52, 57. Edition number: 2. Third Army artillery intelligence map, 1917. In red overprint, "[Printed] by No. 3 Advanced Section A.P.& S.S." "Ordnance Survey, March, 1917." Grey and blue base map; overprint in red and blue. Group areas contain number of guns in each. Front Line after Battle of Arras shown in blue. Covers whole Third Army area from Vermelles in north to Epehy in south, and Doullens in west to Cambrai in east. Manuscript on verso: J. Haworth SLIM. 'D' Coy., Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC16; envelope_number: 463.
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.
Series Number Id: GSGS 2742; Sheet number: 44a (36c) NW; Edition number: 11, Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC24; envelope_number: 735, Manuscript on reverse: OC 193 S[iege] Bty; not linen backed; some small repairs; from collection of Major J.C. Thomson MC (20th Siege Battery).