 Complete the following phrase:  For the final part of the Battle of the Selle on 23 October, II US Corps was relieved by the British IX Corps, which took over most of its Australian and RGA artillery. This massive corps artillery reserve supported the attack into the wooded slopeds beyond the Selle. Again, bad weather hindered air observation and CB work before the attack, but the barrage was deadly accurate. As the regimental historian relates, The guns of Fourth Army demonstrated, on 23rd October, the crushing effect of well co-ordinated massed artillery. They simply swept away the opposition. After a pause to regroup and reconnoitre, IX Corps stormed across the SambreOise Canal on 4 November the 