There were only minor operations until 27 September, when the 6-inch howitzers fired a barrage and concentrations on selected strongpoints to support 5th Division's attack on the Hindenburg Line defences (part of the Battle of the Canal du Nord). The howitzers then fired gas shells as well as high explosive on the trenches round Gouzeaucourt as the Germans abandoned their defences. There were several days of bombardment before the Second Battle of Cambrai opened on 8 October, with 56th Bde's 6-inch batteries moving up to the Escaut Canal. On 10 October 220th Siege Bty moved forward again to Caudry to operate directly under 37th Division as it pursued the Germans across the River Selle. IV Corps' guns then had a quiet period until 20 October, when the corps joined in the Battle of the Selle, taking the high ground beyond the river. The 6-inch howitzers executed a fire programme, then spent the night harassing roads behind the German lines.