Captain Mallinson of the original L&amp;CRGA cadre left the battery on 13 August 1917 to take command of 221st Siege Bty. The campaign ground on during the summer and autumn. During the attack of 20 September (the Battle of the Menin Road Ridge) three of the battery's guns were put out of action. By October the British gunners were struggling to bring up guns and ammunition through the morass of mud to continue the offensive and the gunners of 39th Siege Bty had to be pulled out of the line for rest. They returned later in the month and resumed barrage fire for the Second Battle of Passchendaele until the fighting died down in November.