A preliminary operation was assigned to the II Corps before the general action began. This preparatory task was the capture of the Regina Stuff line of trenches, to be undertaken by the 18th, 25th, and 39th Divisions, from right to left. In this operation the 4th Canadian Division would co-operate by effecting the capture of Regina Trench from Courcelette Trench to a point just before the intersection of the Pys Road, thence approximately along an old German trench to join up with the sapheads which were being built by the 10th Canadian Infantry Brigade, under Brigadier-General William Hughes, D.S.O.
The 11th Brigade, on the left, under Brigadier-General V. W. Odlum, D.S.O., undertook the capture of the portion of Regina Trench assigned to the Division. Meanwhile, the 10th Brigade was to co-operate by pushing forward its saps so as to be able to support the 11th Brigade by an enfilading fire. Each Brigade, by the 19th, had completed a very useful sap, close to the junction of their respective lines, up old German trenches to within two-thirds of the distance to Regina. The 11th Brigade placed the 87th and 102nd Battalions in the line, the former on the right, each Battalion having two companies of the 75th in support.
At noon on the 21st the attack began. The whole operation was an unqualified success. Before the afternoon was far advanced the objectives had all been gained and consolidated, blocks established in Regina and up the Pys Road, and contact effected with the equally successful 53rd Brigade of the 18th Division on the left. The co-operation of the 10th Brigade on the right was all that could be desired. Altogether the result of the action was a welcome change from the disappointments attending the hard-fought and determined attempts against Regina earlier in the month. The new and comparatively raw Division had won its spurs with _éclat_.
On the 25th of the month a second preliminary operation was undertaken. In preparation for this attack the right of the 10th Brigade was extended to the Chalk Pit.
At 7 a.m. the attacking Battalion, the 44th, advanced to the assault, supported by the 46th. Early reports seemed to indicate that the operation had been entirely successful. It soon became evident, however, that this was not the case. The enemy was enabled to hold his trenches in great force and to bring a devastatingly effective enfilading machine-gun fire to bear upon the 44th from the vicinity of the quadrangle. There was nothing for it but to take such cover as was available--old disused trenches and shell-holes, where many remained until dark. The Battalion suffered very heavily, having 3 officers killed and 7 wounded, and of other ranks 29 killed, 152 wounded, and 23 missing. The work of the stretcher-bearers in this action was especially commendable.