At 11.30pm the Germans commenced a barrage of the Aubigny system and neighbouring area with gas-shells. Within three hours the enemy threw over 7,000 shells completely saturating the area with mustard-gas. The men wore their SBR for a considerable period of time and the affected area was evacuated, and shell holes filled in. In spite of the precautions taken, the intensity of the bombardment and the sultry nature of the weather causing the gas to hang about, it was apparent that the casualties were going to be numerous. At the end of 72 hours when the last of the men had been evacuated it was found that the battalion had lost 200 members including the officers commanding A & B companies. Both companies had been severely depleted that the decision was taken to amalgamate them, with Lieut. Abercrombie, MC, taking command. For his action that night in helping to minimise casualties Lieut. Anderson was Mentioned in Dispatches.