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This picture shows a group of signallers at the bottom of Lochnagar crater at La Boisselle on the Somme. The signallers are spelling out 'Somme' in semaphore. The crater was created by the explosion of the Lochnagar Mine on 1 July 1916, the first day of the Battle of Albert.
Many thanks to Pen & Sword for providing us with these pictures, which come from Richard van Emden's The Somme: The Epic Battle in the Soldier's own Words and Photographs