The Left Cavalry Column, after VIVIAN's Brigade had remained in its position for some little time, continued its retreat without further molestation (the Enemy having contented himself with merely detaching a Patrol to watch its movements) along a narrow cross road, running nearly parallel with the Charleroi high road, and leading through the Villages of Glabbaix, Maransart, Aywiers, Frischermont, Smohain, and Verd Cocou. Here VIVIAN's Brigade arrived in the evening, in the vicinity of the Forest of Soignies, and bivouacked; while VANDELEUR's Brigade passed the night somewhat nearer to the ground which had been selected for the position to be taken up by the Anglo-Allied Army. The Right Cavalry Column, consisting only, as previously stated, of the 1st and 2nd Light Dragoons of the King's German Legion, and of the 15th British Hussars, effected its retreat in good order, protected by its Skirmishers, as far as the ford, which it crossed above Genappe. At this point, the French Cavalry suspended its pursuit, and proceeded, in like manner as that on the right had done, to join the main body on the high road; while the British Right Cavalry Column continued its retreat unmolested towards the position of Waterloo, in rear of which it bivouacked. A large body of French Cavalry, consisting of from sixteen to eighteen Squadrons, was now entering Genappe by the Charleroi road, followed by the main body of the French Army under NAPOLEON. The Earl of UXBRIDGE, who was desirous of checking the Enemy's advance, so as to gain sufficient time for the orderly retreat of the Anglo-Allied Army, and to prevent a compromise of any portion of the rearmost troops, decided upon embracing the advantage which the narrow Defile of Genappe seemed to present in aid of his design. The town consists mainly of houses lining the high road, on the Brussels side of the Bridge. The road then ascends a ridge, the brow of which is about six or seven hundred yards distant, and here Lord UXBRIDGE had halted the Heavy Brigades of Lord EDWARD SOMERSET and of Sir WILLIAM PONSONBY, and posted them so as to cover the retirement of the Light Cavalry. At first, he formed them in line; SOMERSET's on the right, and PONSONBY's on the left, of the high road; but observing by the Enemy's formidable advance, that the Light Cavalry would soon be compelled to fall back, his Lordship drew up SOMERSET's Brigade in a Column of half Squadrons upon, but close to, the right of the road itself, so as to admit of troops retiring by its left; and formed PONSONBY's Brigade into a Column of Half Squadrons upon the left of the high road, and somewhat to the rear. The 7th Hussars were formed at some little distance in the rear of Genappe, and the 23rd Light Dragoons were drawn up in support of that Regiment, and about midway between it and the Heavy Cavalry on the Height. The Squadron of the 7th Hussars, under Major HODGE, it will be recollected, was halted between the main body of that Regiment and