At this moment, Colonel KLENCKE reached the Farm with the Lüneburg Field Battalion; which WELLINGTON, on observing the French advance, had detached from the Left of KIELMANSEGGE's Brigade as a reinforcement to the troops of La Haye Sainte. BARING immediately endeavoured to recover the Orchard; and had already made the Enemy give way, when he perceived a strong Line of _Cuirassiers_ forming in right front of the inclosure. At the same time, Lieutenant MEYER came to report to him that the Enemy had surrounded the Garden in which his Company was posted, and that it had become no longer tenable. BARING ordered him to fall back into the Buildings, and to assist in their defence. The Skirmishers upon the right, on the sudden appearance of the Cavalry, ran in upon the Orchard to collect together: but coming in contact with the newly arrived Hanoverians, the latter got into disorder; and the effect produced by the sight of the advancing Line of _Cuirassiers_ in their front, as also by the shouts of the French Infantry gaining possession of the Garden in their rear, was such, that notwithstanding all BARING's exertions to halt and collect his men, the whole of these troops betook themselves to an indiscriminate flight towards the main position of the Allied Army, a course which they seemed to imagine constituted their only chance of safety. They were speedily undeceived. The Cavalry overtook them in the midst of their confused retreat, rode over, sabred, and still further dispersed them; whilst, to add to the severity of their loss, they became exposed, after the Cavalry had passed on, to a flank fire from the Enemy's Infantry lining the hedge of the Garden. A portion of them succeeded in gaining the main position; whilst the remainder, securing themselves in the Buildings, augmented the little garrison under Lieutenants CAREY and GRÆME, and Ensign FRANK, who bravely and successfully maintained possession in defiance of the vigorous attacks on the part of the French Light Troops. The Lüneburg Hanoverian Battalion, however, suffered most severely: many were killed and wounded; among the latter was the Commanding Officer, Lieutenant Colonel KLENCKE, and among the prisoners taken was Major DACHENHAUSEN. Some on the left saved themselves by a precipitate retreat into the high road. The few that were collected together again during the remainder of the day constituted but a very insignificant portion of the original strength of the Battalion.