In the mean time, Colonel MARWITZ had been menaced by the advance of a considerable line of Cavalry and a Battery, which latter annoyed him but little. This Cavalry did not, however, seem much disposed to risk a close encounter: once it put forward a Detachment, which was overthrown by two Squadrons of the 7th and 8th Uhlans, and then a Regiment of French _Chasseurs à Cheval_ fell upon the Skirmishers of the 2nd Regiment of Infantry, but was driven back by two Squadrons of the 5th Kurmark Landwehr Cavalry. Colonel MARWITZ had been ordered by General JÜRGASS to send out Patrols in different directions from the Right Flank, for the purpose of seeking out the communication with the Duke of WELLINGTON's forces. These brought in prisoners, from whom it was ascertained that a whole French Corps, the First, under Count D'ERLON, was in that vicinity. Subsequently, French Cavalry were perceived between Mellet and Villers Perruin; whereupon Colonel MARWITZ, who had been reinforced by two Squadrons of the Pomeranian Hussars, ordered a change of front of his Brigade in this direction, then deployed his eight Squadrons in two lines, with considerable intervals, and withdrew them, alternately, towards the high road; followed, though not vigorously, by three French Regiments of Cavalry and a Battery, comprising JAQUINOT's Light Cavalry Brigade, attached to d'Erlon's Corps. As he approached the _chaussée_, the 2nd and 3rd Battalions of the 2nd Elbe Landwehr, as also the 3rd Battalion of the 22nd Regiment, advanced to his support. Until about six o'clock the action along that part of the line which extended from Sombref to Balatre, had not been carried on with any degree of energy, and the occupation of the opposing forces was generally limited to mutual observation. Now, however, the French Infantry (of which only a small portion was attached to GROUCHY's Cavalry), penetrated as far as the precincts of the Village of Tongrines; but Colonel KÄMPFEN's Brigade (the Tenth), having been successively reinforced by all the Battalions of Colonel LUCK's Brigade (the Eleventh) excepting one which was left in reserve, the French were easily repulsed, and the Prussians maintained full possession of all this portion of their original position. * * * * * It was about seven o'clock when the Aide de Camp returned from his reconnaissance, and reported to NAPOLEON that the Column in the distance which had caused so much uneasiness proved to be D'ERLON's Corps; that GIRARD's Division, upon being undeceived, had resumed its position in the Line of Battle; and that VANDAMME's Corps had maintained its ground.