At one o'clock on January 25, 1915, and with the cooperation of the French on their right, this rapidly improvised force moved forward, making unobstructed progress on their wings by the canal and the road. For some reason their center was delayed and held back. When they did finally arrive and pressed forward with a rush to meet the German forces, who were ready to receive them, the impact was fearful, and the casualties on both sides enormous; but no gains were made by the Allies, and the Germans held the ground they had won. At the height of the battle the Second Royal Sussex rushed into the fray in support of their hard-pressed comrades, but all to no purpose, for these as the others were forced back to the rear of their starting point with but a fraction of their forces remaining to report the events of the day. While this terrible slaughter was in progress, the French left on the other side of La Bassee road, which separated the Allies at this point, had been attacked by the right of the German line, and driven back to a considerable distance, but not as far back as the British, so that the French left was in advance of the British right and badly exposed to flank attack from the northward. This obliged the entire allied forces to retreat some distance farther to the rear, and as night came on and the severity or the action had ceased, the Allies had an opportunity to realign their positions and somewhat strengthen the same by the First Guard Brigade which now came up, showing the terrible suffering to which they had been subjected. Finally, however, it was found advisable to withdraw the Guard altogether and replace them by the First Infantry Brigade. Now the German tactical idea became clear. It was to force the British to concentrate on the exposed line between Festubert and Givenchy, north of the canal, and then to turn the British right by the German forces in their new position just south of the canal, thus calling for simultaneous action on both sides of the canal.