Edition: 1. Trenches corrected to 20th June 1918, with overprint 16/8/18. [1st] Field Survey Battn. R.E. 6416. Overprint: Intelligence Map No. 2 / T415 / "A" [I] Corps Topo. Festubert area 1918. Detail, grid & contours grey. German trenches & names red. British trenches blue. Intelligence in blue. Roads & tracks yellow. From Major J.C. Thomson MC (20th Siege Battery). Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC17; envelope_number: 506
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