This important arrangement being made, another was adopted equally necessary to deceive and observe Napoleon. Ten thousand cavalry were selected, under the enterprising generals, Winzengerode and Czernicheff, who, with fifty pieces of cannon, were despatched to hang on Buonaparte's march, to obstruct his communications with the country he had left, intercept couriers from Paris, or information respecting the motions of the allied armies, and to present on all occasions such a front, as, if possible, might impress him with the belief, that their corps formed the vanguard of the whole army of Schwartzenberg. The Russian and Prussian light troops meanwhile scoured the roads, and intercepted, near Sommepuix, a convoy of artillery and ammunition belonging to Napoleon's rear-guard, when twenty pieces of cannon, with a strong escort, fell into their hands. They also cut off several couriers, bringing important despatches to Napoleon from Paris. One of these was loaded with as heavy tidings as ever were destined to afflict falling greatness. This packet informed Napoleon of the descent of the English in Italy; of the entry of the Austrians into Lyons, and the critical state of Augereau; of the declaration of Bourdeaux in favour of Louis; of the demonstrations of Wellington towards Toulouse; of the disaffected state of the public mind, and the exhausted condition of the national resources. Much of these tidings was new to the allied sovereigns and generals; but it was received by them with very different sensations from those which the intelligence was calculated to inflict upon him for whom the packet was intended. Blucher, in the meantime, so soon as he felt the opposition to his movements diminished by the march of Buonaparte from Chalons to Arcis, had instantly resumed the offensive, and driven the corps of Mortier and Marmont, left to observe his motions, over the Marne. He passed the Aisne, near Béry-le-Bac, repossessed himself of Rheims by blowing open the gates and storming the place, and, having gained these successes, moved towards Chalons and Vitry. His course had hitherto been south-eastward, in order to join with Schwartzenberg; but he now received from the King of Prussia the welcome order to turn his march westward, and move straight upon Paris. The grand army adopted the same direction, and thus they moved on in corresponding lines, and in communication with each other.