Series Number Id: GSGS 3265. Sheet number: 57D NE. Edition number: 2. Battle of the Somme, Gommecourt salient: artillery intelligence, German battery positions and arcs of fire 2-10-16. "Ordnance Survey 1916." "1st Printing Co. R.E. 3rd Army (1106)." "Minor corrections to detail made 11-5-16." Detail, grid and contours grey; water blue. Overprinted with pecked purple British front line and pecked red German front line. Overprinted in purple: [German battery positions and arcs of fire]; Conventional Signs - Gun, How, with battery reference numbers. Light railways overprinted red. Purple and red plates registered with needles., WW1 Trench Map Collection: Box PC16, Envelope 432.