The attack was to begin at 5:30 am on Easter Monday, 9 April 1917. The attack was originally planned for the morning of 8 April (Easter Sunday) but it was postponed for 24 hours at the request of the French. During the late hours of 8 April and early morning of 9 April the men of the leading and supporting wave of the attack were moved into their forward assembly positions. The weather was cold and later changed to sleet and snow. Although physically discomforting for everyone, the northwesterly storm provided some advantage to the assaulting troops by blowing snow in the faces of the defending troops. Light Canadian and British artillery bombardments continued throughout the night but stopped in the few minutes before the attack, as the artillery recalibrated their guns in preparation for the synchronized barrage. At 5:30 am, every artillery piece at the disposal of the Canadian Corps began firing. Thirty seconds later, engineers detonated the mine charges laid under no man's land and the German trench line, destroying a number of German strong points and creating secure communication trenches directly across no man's land.