"It is safe to say," writes Sir Max Aitken, the Canadian record officer, "that the youngest private in the ranks, as he set his teeth for the advance, knew the task in front of him, and the youngest subaltern knew all that rested on its success. It did not seem that any human being could live in the shower of shot and shell which began to play upon the advancing troops.
"They suffered terrible casualties. For a short time every other man seemed to fall, but the attack was pressed ever closer and closer. The 4th Canadian Battalion at one time came under a particularly withering fire. For a moment--not more--it wavered. Its most gallant commanding officer, Lieutenant-Colonel Birchall, carrying, after an old fashion, a light cane, coolly and cheerfully rallied his men, and at the very moment when his example had infected them, fell dead at the head of his battalion. With a hoarse cry of anger they sprang forward (for, indeed, they loved him) as if to avenge his death.
"The astonishing attack which followed, pushed home in the face of direct frontal fire, made in broad daylight, by battalions whose names should live for ever in the memories of soldiers, was carried to the first line of the German trenches. After a hand-to-hand struggle, the last German who resisted was bayoneted, and the trench was won."
The Canadian left was now safe. The German trench was occupied, and held against all comers in the teeth of every kind of deadly missile that could be hurled against it. It was still in the hands of the victors on Sunday, 25th April, when all that remained of the war-broken battalions was relieved.
At 4 a.m. on the morning of Friday, the 23rd, the Germans sent a great discharge of poison gas against the 2nd Brigade, which held the line running north-east, and upon the 3rd Brigade, which had continued the line up to the pivotal position and had then spread down in a south-easterly direction. In two minutes a cloud seven feet high rolled from the German trenches into those of the Canadians. The defenders had no respirators, but some of them wrapped wet handkerchiefs about their mouths, and thus obtained a little relief. They dared not retire, even if they had wished to do so, for the gas would follow them, and the exertion would cause them to draw deeper breaths of the deadly vapour. So, with blue, swollen faces and bloodshot eyes almost bursting from their sockets, they held on. Men went sick and giddy a thousand yards behind the line, and even the grass and trees grew white as the fumes passed over them.