The Battle of the Somme was now entering its most intense phase. On 4 August, 23rd Division was ordered to attack a communications trench known as Munster Alley that was in German hands. The soldiers dug an assault trench and named it 'Butterworth Trench' in their officer's honour. In desperate fighting during the night of 4–5 August, and despite friendly fire from Australian artillery, Butterworth and his miners captured and held on to Munster Alley, albeit with heavy losses. At 04:45 on 5 August, amid frantic German attempts to recapture the position, Butterworth was shot through the head by a sniper. His body was hastily buried by his men in the side of the trench, but was never recovered for formal reburial following the fierce bombardments of the final two years of conflict.