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.
While Buonaparte, retiring to the east, prepared for throwing himself on the rear of the allies, he was necessarily, in person, exposed to the same risk of having his communications cut off, and his supplies intercepted, which it was the object of his movement to inflict upon his enemy. Marmont and Mortier, who retreated before Blucher over the Marne, had orders to move upon Vitry, probably because that movement would have placed them in the rear of Schwartzenberg, had he been induced to retreat from the line of the Aube, as Napoleon expected he would. But as a very different course had been adopted by the allies, from that which Napoleon had anticipated, the two maréchals found themselves unexpectedly in front of their grand army near Fère-Champenoise. They were compelled to attempt a retreat to Sezanne, in which, harassed by the numerous cavalry of the allies, they sustained heavy loss.
While the cavalry were engaged in pursuit of the maréchals, the infantry of the allies were approaching the town of Fère-Champenoise, when a heavy fire was heard in the vicinity, and presently appeared a large column of infantry, advancing checker-wise and by intervals, followed and repeatedly charged by several squadrons of cavalry, who were speedily recognised as belonging to the Silesian army. The infantry, about 5000 in number, had left Paris with a large convoy of provisions and ammunition. They were proceeding towards Montmirail, when they were discovered and attacked by the cavalry of Blucher's army. Unable to make a stand, they endeavoured, by an alteration of their march, to reach Fère-Champenoise, where they expected to find either the Emperor, or Marmont and Mortier. It was thus their misfortune to fall upon Scylla in seeking to avoid Charybdis. The column consisted entirely of young men, conscripts, or national guards, who had never before been in action. Yet, neither the necessity of their condition, nor their unexpected surprise in meeting first one, and then a second army of enemies, where they looked only for friends, could induce these spirited young men to surrender. Rappatel, the aide-de-camp of Moreau, and entertained in the same capacity by the Emperor Alexander, was shot, while attempting, by the orders of the Emperor, to explain to them the impossibility of resistance. The French say, that the brother of Rappatel served in the company from which the shot came which killed the unfortunate officer. The artillery at length opened on the French on every side; they were charged by squadron after squadron; the whole convoy was taken, and the escort were killed, wounded, or made prisoners.[16]