On the 19th October the Division entrenched on the line it had won.

To the right were French cavalry and cyclists, covering the gap between the right of the III Corps and the left of the I Corps near Aubers.

The advance from Hazebrouck to the ridge had occupied six days, and cost the Division some 750 casualties.
On the morning of the 20th October the Germans attacked very heavily on the whole front.

Fighting on a very extended front (five miles) and with very little in hand, the Division was soon in difficulties, particularly on the exposed left flank, where the Leinsters had their three left companies quickly driven in, and the situation at midday was critical.

One company with the machine-guns was able to hold on until the afternoon at Mont de Premesques, and to withdraw under cover of darkness, having inflicted heavy loss on the enemy.