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. [Illustration: Gassed! (_From the picture by F. Matania. By permission of The Sphere._) "The green mist came rolling towards the parapet from the enemy's empty front trench, several hundred yards away. It looked like a vapour rising from a marsh, and the wind was strong enough to carry it rapidly towards the parapet. One battalion had time to fire two rounds through the screen of gas before it came pouring over the sand-bags, penetrating into every crevice of the dug-outs, and choking the men who lay there. It was so thick at first that objects three feet distant could scarcely be seen."] Many of the men were struck down by the fumes, and the Royal Highlanders of Montreal, 13th Battalion, and the 48th Highlanders, 15th Battalion, specially suffered. For a short time the 48th were obliged to withdraw a short distance from their trench. Soon, however, they were their own men again, and they advanced and reoccupied their old position. The Germans, as you know, had long been striving to drive back the devoted 3rd Brigade, in order to sweep round and overwhelm its left wing. In the course of the attacks a large number of the enemy managed to slip in between the wood and St. Julien. For a time it seemed as though the Germans had succeeded, and that the last obstacle to their advance would be swept away. Not only the men of the 13th Battalion, but of every other battalion, fought like heroes to avert the danger. All that mortal men could do they did. Major Norsworthy, who had already been disabled by a bullet, was bayoneted and killed while rallying his men. Major M'Cuaig, who had been seriously wounded in a hastily-constructed trench, insisted on being left behind lest he should be a hindrance. So fierce and constant were the German attacks that orders were now given for the brigade to retire.