The 5th Battalion party, under Lieuts. J. E. Purslow and K. L. T. Campbell, was checked directly beneath the German parapet by an obstacle which had been overlooked by their reconnoitring party. That obstacle was a trench or ditch about 12 feet wide and 6 feet deep, full of water from the overflow of the Douve. In the water, rising from the bottom of the ditch to within a couple of feet of the muddy surface, were coils and tangles and strands of barbed wire. Five men of the party fell into this ditch and were with difficulty rescued. The officers made several attempts to negotiate it, only to learn that it could not be crossed either by swimming or wading. As further investigations failed to disclose a passage across the wired and flooded ditch, the party bombed across it into the heavily-manned trench. This grenade fire, delivered at a considerable distance from the 7th Battalion's point of attack, doubtless served well in misleading the enemy as to the extent and exact location of the threat against his front. Also, it must have caused him numerous casualties.
Their supply of grenades exhausted, the 5th Battalion party returned to their own line.
In the meantime, the British Columbians (7th Battalion) had left our front-line trench by way of a gap in our parapet in front of Irish Farm. Led by scouts along the Douve, they crossed the bridges, passed the lanes through the enemy wire, and scaled the hostile parapet, and commenced operations.
Capt. C. T. Costigan, grenade instructor for the brigade, led one party of thirteen men, and Lieut. McIllree led another. These parties were composed of bayonet-men, grenadiers, grenade-carriers, wire-men, and shovel-men. Every man wore a black mask, and none carried any badge or mark of identification. Each bayonet-man had a small electric lamp fastened to his bayonet in such a way that he could flash it without shifting his grip on the rifle.
Lieut. A. H. Wrightson followed with the rifle party and telephone. His command consisted of five riflemen, a telephonist, a linesman, and two stretcher-bearers.
Before the raiders reached the German wire a sudden heavy downpour of rain commenced. Under the black screen and splashing patter of the storm our men went over the enemy parapet. Capt. Costigan and Lieut. McIllree dropped into the trench together—on top of a German sentry crouched beneath a sheet of corrugated iron, seeking shelter from the rain. McIllree shot the sentry, seized another German, disarmed him and threw him down, then clubbed yet another of the enemy with the German rifle. He was then overtaken by his men, and they all moved down the trench to the right, bombing, bayoneting, and shooting as they went. In the meantime, Capt. Costigan—a medium-sized officer of the most charming manners—had dispatched three of the enemy with his revolver and bombed his way along the trench to the left for a distance of three bays before being joined by his party.
The trench was heavily garrisoned, and (as we afterwards learned from the prisoners) the men had been warned by their officers to expect an attack, but all the forewarning had not forearmed them sufficiently for their salvation.
For twenty minutes the Canadians toiled terribly in the outraged stronghold of the enemy, by the light of star-shells from the German support trenches, under a tumult of fire from artillery and machine-guns in both lines and the crashing of their own bombs. The dug-outs were full. While our raiders made prisoners of the occupants of some dug-outs by dragging them bodily forth, and dead men of others by simply throwing grenades in at the narrow doorways, our artillery made a barrage in the rear of the invaded trench and our machine-guns searched with their fire all the roads by which German reinforcements would be likely to move. Lieut. Wrightson, with his rifle party, remained at the point of entry into the German trench during the bombing. He communicated the progress of the affair by telephone to the Commanding Officer of the 7th Battalion, and the officer in charge of operations (Capt. L. J. Thomas) guarded against a German counter-attack from the rear and passed prisoners over the parapet to our scouts. The scouts took the prisoners as they came over the parapet to our bridge-covering parties; these in turn passed them back to a strong party which supported one of our listening posts, and from the listening post they were handed back to and through the gap in our front line.
When the allotted time of twenty minutes was up, Lieut. Wrightson gave the signal for the bombing parties to get out and come back.
As soon as our men were clear of the enemy's parapet our artillery dropped its fire from the German communicating roads and rear positions to the bombed trench, in the hope of catching the reinforcements which the enemy was sure to have got up by this time at all costs to repulse the invasion. It is probable that our gunners' hope was realised.