On the night of September 12/13th the battalion moved forward to the Buissy Switch line and relieved the 27th Canadian Infantry Battalion. Relief was completed without casualties at 9.30p.m. September 13th dawned bright and clear and aerial activity was above normal. In the evening a working party of 4 officers, 25 N.C.O’s and 200 men proceeded forward to construct defenses under the supervision of Major MacCallum, 4th Battalion Canadian Engineers. One other rank of this party was wounded shortly after the party had started work.