The Twelfth Division formed the flank of Pulteney's Third Corps. Upon its right was Snow's Seventh Corps, the left-hand unit of which was the Fifty-fifth Division of Lancashire Territorials, which had not been involved in the advance, and indeed was nominally resting after its supreme exertions at Ypres where it had taken a notable part in battle after battle. It had been planned, however, that some demonstration should be made upon this front in order to divert the enemy's forces and to correspond with the attack at Bullecourt upon the north. This was carried out by the 164th Brigade and may have had the desired effect although it gave no permanent gain. A point called the Knoll, with an adjacent farm, was carried by the stormers and was held for most of the day, but they were forced back to their own old lines in the evening, after a long day of battle in which they incurred such heavy losses that the brigade was seriously crippled at a later date when the full strength of the division was urgently needed. This ended the first day of the battle, which represented a considerable victory, and one which vindicated the enterprise and brain-power of the British inventor and engineer as much as the valour of the soldier. The German line was deeply indented over a front of 6 miles and to a depth of 4½ miles. More than 5000 prisoners with many guns had been taken. The famous Hindenburg Line had been severed. The villages of Havrincourt, Graincourt, {253} Ribecourt, Marcoing, Noyelle, and Mesnières were all in British hands. It was a good beginning, so good that it was determined not to suspend the operations, but to try the results of a second day and see what could be attained before the arrival of the full German supports. Even with their excellent rear organisation and their great junction at Cambrai, it was hoped that a clear forty-eight hours must pass from the opening of the battle before they could build up a really formidable line. There were no operations of any importance during the night of the 20th, but early upon November 21 the British line began to move forward once more, the same divisions being engaged in the advance. In the north the Ulstermen, who had attained the line of the Cambrai-Bapaume Road, crossed that boundary and pushed onwards up the slope for about a mile until they reached the outskirts of the village of Mœuvres which they were unable to retain. It was soon apparent, both here and at other points along the line, that the Germans with their usual military efficiency had brought up their reserves even more rapidly than had been expected, and the resistance at Mœuvres was so determined that the tired division was unable to overcome it. The 169th Brigade of the Fifty-sixth Division pushed up on the left of the Ulstermen and occupied the German outpost line, from which they were able later to attack the main Hindenburg Line.