Our narrative of the events upon the left wing of the army has now got in front of the general account, but as the operations of General Gough's force have {203} definite objectives of their own, the story may now be continued up to September 15, after which we can leave this flank altogether for a time and concentrate upon the happenings in the centre, and especially upon the right flank where Delville Wood, Ginchy and Guillemont had presented such impediments to the advance. At or about the time, September 4, when the Canadians took over the lines of the Australians at Pozières and Mouquet Farm, the Eleventh British Division, the First English Division of the New Army, which had come back from hard service in the East, relieved the Twenty-fifth Division upon the Canadian left. For a week there was quiet upon this part of the line, for a great forward move along the whole eleven-mile front had been planned for September 15, and this was the lull before the storm. On the evening before this great assault, the Eleventh Division crept up to and carried the main German stronghold, called the Wonderwork, which lay between them and Thiepval. There was some sharp bayonet work, and the defeated garrison flying towards Thiepval ran into the barrage so that the enemy losses were heavy, while the British line crept up to within 350 yards of the village. This advance stopped for ever the flank fire by which the Germans were able to make Mouquet Farm almost untenable, and the Canadians were able to occupy it. The capture of the Wonderwork was carried out by Price's 32nd Infantry Brigade of Yorkshire troops. The most of the work and the heaviest losses fell upon the 9th West Yorks, but the 8th West Ridings and the 6th Yorks were both engaged, the latter losing their colonel, Forsyth. The total casualties came to 26 officers and 742 men.