Series Number Id: GSGS 2742; Sheet number: 57dNE. Ed. 4A.
Trenches to 7th February 1917. OS February 1917. German trenches and names red; British trenches to depth of 300 yards blue. Situation after Battle of the Somme and before German retirement to Hindenburg Line. From Major J.C. Thomson MC (20th Siege Battery).
Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC##; envelope_number: ###