On 1 July 1916 , the first day on the Somme , La Boisselle was attacked Attack by the 34th Division as part of the III Corps but the bombardment Attack had not damaged Damaging the German deep-mined dug-outs ( ) and a German listening Perception_active post overheard a British telephone conversation Communication the day before , which gave Giving away the attack .

It formed Cause_to_amalgamate part of the German defensive Defending system in the Somme sector of the Western Front during the First World War and consisting Cause_to_be_included of a mass of machine-gun emplacements , trenches and dug-outs .