Series Number Id: GSGS 3279. Sheet number: parts of sheets 57c SW & 62c NW. Tank map, used at Battle of Flers 15 September 1916. "Trenches corrected to 5-8-16." "Ordnance Survey, 1916." Detail, grid and contours grey. All trenches red (including those occupied by British). Title printed on reverse. Manuscript on face: many trench and road names, new trenches, and details of sunken road and cutting depths, road going conditions and other details specially reconnoitred for tanks. Manuscript on reverse: Major J. Best, M.G.C. The Tank Corps was at first known, for security reasons, as the Heavy Branch, Machine Gun Corps., Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC14; envelope_number: 379.