The attack was delivered at 1.20 a.m.on 23rd October in a dense fog; the 1st Division being on the right and the 25th Division on the left.

Three sections of 301st American Tank Company were allotted to the Division, and did excellent work in smashing fences and destroying machine-gun nests, though, owing to the fog, the infantry lost touch with them almost at once.
On the right the 18th Infantry Brigade, which attacked with the 2nd D.L.I.on the right and the 1st West Yorkshire Regiment on the left, had a less difficult task than the 71st Infantry Brigade, but were delayed in crossing the gas-shelled valley in their immediate front, and met with opposition from various farms.

However, they fought their way steadily forward during the day, and by the late afternoon their right battalion had reached its objective and had pushed its patrols down to the canal, and the left battalion, having reached its first objective, was struggling forward to its second.
The 71st Infantry Brigade on the left attacked with the 9th Norfolk Regiment and the 1st Leicestershire Regiment.

Its attack soon became disorganized in the very enclosed country, was unable to keep pace with its barrage, lost touch with its tanks in the fog, and was soon held up on a line not more than about 400 yards beyond that from which it had started.

Fighting continued throughout the day, and finally, taking advantage of the progress made by the 25th Division on its left, the 71st Infantry Brigade was able by night to reach a line about half-way through the Bois l'Eveque.
During the night this brigade was relieved by the 16th Infantry Brigade (Brig.-Gen.