The 19th Battalion continued to hold positions in the Canadian craters until relieved on the 12th. Among conspicuous acts of bravery at this time was that of Corporal A. F. Lynch, who went out and dragged in a machine gun the entire crew of which had been killed. Attempts were repeatedly made to wrest the lost positions from the enemy, but all failed. On the night of April 11, 1916, the Fourth Brigade was relieved by the Fifth; their casualties were 14 officers and 389 men. It was decided to reconstruct the old British line and hold fast to the two craters then in possession. The Fifth Brigade under General Watson began the work of reconstruction. The relief of the Fourth started on the 11th, and General Watson took over the line the next morning. By April 13, 1916, the relief was accomplished. The position taken over consisted of trenches and posts in the old British line, the Craters 6 and 7, advanced trenches in Crater 1, and Sackville center and outposts to the north. The work of consolidating this last position fell to the 24th (Victoria Rifles). In the night of April 14-15, 1916, Lieutenants Robertson and Duclos made two daring reconnoissances. Major Ross and Lieutenant Greenshields also went out on the same dangerous mission, gaining information that led to a strengthening of the posts in the old German trench leading to Crater 2, and the approaches to Crater 1. Brigadier General Watson saw the necessity of making over a strong front line, and this was carried out under heavy fire. The Germans launched four successive bombing attacks on the night of the 14th which were repulsed by bombers under Lieutenant Farish, grenade officer of the 25th. After that, action merged into ordinary trench warfare though the artillery continued active. On the 16th the weather conditions enabled aeroplanes once more to carry out observations. Then it was discovered that Craters 4 and 5 were in German hands and Craters 6 and 7 held by the Canadians. So heavy was the German fire on the Canadian craters during the succeeding days that the High Command considered abandoning them, but finally decided that they must be held at whatever cost. Brigade relieved brigade, and every effort was made to strengthen the positions. Early in the morning on the 15th the Germans made a powerful bombing assault on Craters 6 and 7. Communications were broken and runners who tried to get through to the main position were killed or driven back. The 25th held on until relieved by parties of the 24th on the 16th. The relieving force immediately were called on to beat off another enemy attack.