On the following day the 36th Division actually lost a little ground instead of gaining it. An attack carried out at dawn by the 1st and 9th Irish Fusiliers, under a light artillery barrage, insufficient to keep down the very heavy machine-gun fire, was unsuccessful. A heavy hostile counter-attack drove our troops back beyond their original line. The 108th Brigade had now been fighting for four days, with no shelter but that of old and dirty trenches, in persistent rain. The men were in good spirits still, but fatigue was beginning to tell upon them. It was decided that the 107th Brigade should relieve them after dusk, to continue the attack upon the morrow. The 108th Brigade had captured thirty-five prisoners and three machine-guns. Its casualties, however, especially during the last two days, had been very heavy, numbering upwards of four hundred. The 29th Division, on the right, was again being relieved by the 31st. The night of the relief was very unpleasant. The Germans, beginning about ten o'clock, deluged all the low-lying valleys with mustard and other gas shell. The new advance was to be supported by the fire of two Machine-Gun Companies, instead of the one which had been in action hitherto. Captain Walker describes how he rode out in the darkness to find his sections, scattered among battalions of the 109th Brigade in reserve, and came into the cloud at Neuve Eglise, forced to keep his eyes uncovered to find his way, but keeping the nose-clip and mouth-piece of his respirator in position. When dawn broke he discovered that the pool of gas lying in the basin in which 107th Brigade Headquarters were situated almost lipped the entrance floor of the dug-out. Most fortunate it was that the dug-out was half-way up the side of the basin. When, later, he walked down the main road to Wulverghem, he found the occupants of the dug-outs which bordered it "being sick by the score." A good many casualties were caused during the relief, but for the most part the gas was not of the most noxious sort, and many of those who had inhaled it were able to take part in the action of September the 6th. It had the effect, however, of delaying the relief. When dawn broke all the companies of the 2nd Rifles were not in position; nor was it possible to move them forward afterwards, owing to the forward slope on which that position lay being in full view of the enemy. The 36th Division Artillery was now prepared to put down a really effective barrage, to advance at the rate of a hundred yards in three minutes, then to form a protective curtain two hundred and fifty yards in front of the objective, till an hour and a half after Zero. This objective was the old British front line, from the Douve on the right to the Wulverghem-Messines Road on the left.