On the left was "G" Battalion, with Havrincourt village as its first main objective, and on our right was "E" Battalion, beyond which were the 2nd and 3rd Brigades of the Tank Corps. There was one tank to every thirty yards of front!

Until the 17th the enemy apparently suspected nothing at all; but on the night of the 17th–18th he raided and captured some prisoners, who fortunately knew little. He gathered from them that we were ourselves preparing a substantial raid, and he brought into the line additional companies of machine-gunners and a few extra field-guns.

The 19th came with its almost unbearable suspense. We did not know what the Germans had discovered from their prisoners. We could not believe that the attack could be really a surprise. Perhaps the enemy, unknown to us, had concentrated sufficient guns to blow us to pieces. We looked up for the German aeroplanes, which surely would fly low over the wood and discover its contents. Incredibly, nothing happened. The morning passed and the afternoon​—​a day was never so long​—​and at last it was dusk.

At 8.45 P.M. my tanks began to move cautiously out of the wood and formed into column. At 9.30 P.M., with engines barely turning over, they glided imperceptibly and almost without noise towards the trenches. Standing in front of my own tanks, I could not hear them at two hundred yards.

By midnight we had reached our rendezvous behind the reserve trenches and below the crest of the slope. There we waited for an hour. The Colonel arrived, and took me with him to pay a final visit to the headquarters of the battalions with which we were operating. The trenches were packed with Highlanders, and it was with difficulty that we made our way through them.

Cooper led the tanks for the last half of the journey. They stopped at the support trenches, for they were early, and the men were given hot breakfast. The enemy began some shelling on the left, but no damage was done.

At 6.10 A.M. the tanks were in their allotted positions, clearly marked out by tapes which Jumbo had laid earlier in the night....

I was standing on the parados of a trench. The movement at my feet had ceased. The Highlanders were ready with fixed bayonets. Not a gun was firing, but there was a curious murmur in the air. To right of me and to left of me in the dim light were tanks​—​tanks lined up in front of the wire, tanks swinging into position, and one or two belated tanks climbing over the trenches.

I hurried back to the Colonel of the 6th Black Watch, and I was with him in his dug-out at 6.20 A.M. when the guns began. I climbed on to the parapet and looked.

In front of the wire tanks in a ragged line were surging forward inexorably over the short down grass. Above and around them hung the blue-grey smoke of their exhausts. Each tank was followed by a bunch of Highlanders, some running forward from cover to cover, but most of them tramping steadily behind their tanks. They disappeared into the valley. To the right the tanks were moving over the crest of the shoulder of the hill. To the left there were no tanks in sight. They were already in among the enemy.