A whole series of mines, the greatest ever used in war, was to be fired at "Zero." Of these there were three on the 36th Division's front: one at Kruisstraat Cabaret, one at Spanbroekmolen, and one at Peckham. The second had been doubtful up to the last minute. The passage to the charge had been cut some time before by a German defensive "camouflet," and it had seemed as though the toil of a year and of thousands of men had been wasted. The tunnellers of the 171st Company had laboured unceasingly to cut a new gallery. On the eve of the action a scribbled note from the commanding officer to Colonel Place, G.S.O.1. of the Division, announced that the work was accomplished and that it was "almost certain" the mine would go up. In case there might be failure with this or any other charge, the assaulting infantry was instructed not to wait more than fifteen seconds after the opening of the barrage before leaving its trenches. For the evacuation of the wounded there was an Advanced Dressing Station at Lindenhoek, close to the main road, skilfully prepared by the 109th Field Ambulance. Wounded could be carried into the main shelter by the entrance on the north side, from the trench tramway, given what attention was necessary, and conveyed out by the exit on the west side, where the motor ambulances of the Division arrived by a specially constructed semi-circular road. This relieved the main road at that point, and enabled the cars to sweep round without turning. The cars bore the wounded to the Main Dressing Station just east of Dranoutre, manned by the 108th Field Ambulance, while "walking wounded" were sent by a specially-marked track to the Main Dressing Station prepared for them and manned by the 110th Field Ambulance a mile east of the village. From these Dressing Stations the Motor Ambulance Park had the task of carrying the wounded to the two Casualty Clearing Stations in Bailleul. Distances were shorter and roads better than on the Somme; and, had the casualties been as many as on that occasion, they would have been removed in less than half the time and with far less discomfort to the wounded. As it most happily chanced, the casualties were less than a fourth of those at Thiepval. So much for the preparations. Any of importance which have not been mentioned will appear in the account of the actual battle.