After carrying out HF tasks and fire support for preliminary operations to close up to the Hindenburg Line, 83rd Bde was ready to support IX Corps' attack on the St Quentin Canal. After two days' bombardment of enemy trenches and machine gun positions, the assault went in on 29 September. 46th (North Midland) Division, which had to storm the canal itself, had the heaviest level of artillery support of any British division in the war. 69th Siege Bty's role was to breach the canal embankment from Bellenglise to the canal bend in an attempt to drain the water. The assault was a smashing success: 46th (NM) Division swarmed over the canal across captured bridges and dams, using lifebelts and planks, and took its final objectives before nightfall. Next day 69th Siege Bty fired concentrations on Thorigny (near Lehaucourt) supporting 1st Division's successful follow-up attack.