By the end of September Fourth Army had closed up to the Hindenburg Line. 12th Brigade came under the command of IX Corps once more for the assault crossing of the St Quentin Canal on 29 September. The canal defences were largely destroyed by the heavy guns, which continued firing on the canal banks until the last possible moment as 137th (Staffordshire) Brigade stormed the outpost line and then scrambled across the canal in the morning mist. 70th Siege Bty crossed the canal on 1 October to support 32nd Division's attack on the Beaurevoir Line.