The whole état major of the French was observed to have collected in front of the left of the British; after some consultation amongst the officers who composed it, they appeared to have decided upon a new arrangement of their army. The aides-de-camp were despatched in different directions, and soon after the French divisions were observed to be moving to their new destinations. It now seemed to be the intention of the enemy to bring the great body of his force to act upon that part of the British line which was occupied by the Guards; and, at the same time, to move with three columns of infantry and a regiment of cavalry, along the valley which extended under the height which formed the left of the British line. These columns were supported by some light infantry, which the enemy had thrown upon the chain of hills which run westward beyond the valley, and which were destined to turn the British left and attack it upon the flank and rear.
To meet this movement Sir Arthur Wellesley directed the cavalry (which was concealed in the valley) to be prepared to charge the columns of infantry, as soon as they should have extended their formation, and exposed their flank. He also directed the guards to be prepared for the attack which was going to be made upon them, and upon no account to move from the ground they occupied.
The French columns of infantry which had moved into the valley, were more advanced than those destined for the attack upon the Guards; they had halted near a house within gun-shot of the British left, and appeared to be waiting for orders to advance. Major General Payne, who commanded the British cavalry, seized this opportunity to attack them; the enemy, observing the forward movement of the cavalry, formed himself against the side of this house in solid column; he had a deep ravine, or water-course, along his front, of which the British cavalry was not aware, and he was besides supported by sixteen guns. The charge of the cavalry was thrown into confusion by this ravine; many of the horses fell into it; and the portion which got over it was so divided and broken as a body, that the effect of the charge was completely done away. The bravery of the British soldier was not, however, to be daunted by this check. The Honourable Major Ponsonby led the men who were near him upon the bayonets of the enemy; but their valour could not compensate for the total confusion into which they had been thrown. The bravery of individuals could effect nothing against a solid body of infantry; the soldiers who were repulsed by the French columns galloped forward upon the regiment of cavalry which supported them, and in a short time the whole plain was covered with British dragoons dispersed in all directions, and totally without formation. In this state they were charged by some French regiments which were in reserve; many of them were taken, the remainder passed through the intervals in the French columns, and those that escaped their fire, (of whom Lord William Russel was one), retired within the British lines.