Series Number Id: GSGS 3073. Edition number: 1, June 11th, 1915. "O.S.O. 1915." Detail, grid & contours black; German trenches & battery positions red; water, 2-fig coordinates & grid capital letters blue; British front pecked black. Not printed on reverse. Includes collectors stamp. This large sheet was a redrawing of the earlier (May) Haisnes and Loos demy sheets, which were prepared when the line S of Cuinchy was taken over from the French Tenth Army. These sheets had been copied from the French war plans directeurs (but with British squaring) and printed by the Printing Company RE at GHQ, not at the OS. The Auchy - Lens sheet was superseded by regular series 1:10,000 sheets in July and August 1915, but in fact many formations and units continued to use it up to the start of the Battle of Loos on 25 September;, Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC21; envelope_number: 648, Manuscript on face: Lone Tree.