In the night of June 12, 1916, the German trenches were bombarded for four hours and at 1.30 a. m. the battalions advanced in three successive lines. All the battalions gained their objectives. The 16th reached Mount Sorrel on the right, the 16th Hill 62 in center, and the 13th the old lines to the north of this. During the night of the 12th German positions had been heavily shelled and at 1.30 a. m. on the 13th, Lieutenant Colonel Allen led the 3d Toronto Battalion forward with the 1st in support, and captured the German first line. A fortified post in the enemy's hands was carried by assault, and the objective was won forty minutes after the action began. Colonel J. E. Leckie of the 16th Battalion (center attacked) had discovered an old trench 100 yards nearer their objective and two lines were passed up to the unmarked trench unknown to the enemy. The Germans were hemmed in front and rear before they learned of the presence of the Canadians. The two supporting lines did not have the same good fortune, but suffered heavily from shell fire as they climbed the parapet. The second two waves of the 16th encountered strong resistance as they approached the German front line, and Captain Wood, an American army officer, was killed. The trench was taken and the defenders killed or made prisoners. A machine gun a short distance away, which gave the Canadians trouble, was silenced by Captain Bell-Irving, who dashed from the line and killed the gun crew. Line after line was carried. The 16th recaptured the heights, their old ground, and linked up with the 3d Battalion. The 13th Battalion (Royal Highlanders of Canada) under Lieutenant Colonel Buchanan, after some bombing encounters, broke through to the north of Hill 62 and joined up with the 16th on the right. The 58th (Colonel Genet) had fought their way up the communication trenches and the circle from left to right was complete. The First Division, through error caused by the dim light, occupied a trench that was fifty yards from their objective. Bombing posts were established down the German communication trenches, but the Germans did not attempt a counterattack. When the morning dawned at last, the Canadians were once more masters of the heights defending the Ypres salient.