The defeat of Oudinot and Gerard obliged Maréchal Macdonald, who defended the line of the river above Bar, to retreat to Troyes, from his strong position at La Ferté-sur-Aube. He therefore fell back towards Vandœuvres. But though these three distinguished generals, Macdonald, Oudinot, and Gerard, had combined their talents, and united their forces, it was impossible for them to defend Troyes, and they were compelled to retreat upon the great road to Paris. Thus, the headquarters of the allied monarchs were, for the second time during this changeful war, established in the ancient capital of Champagne; and the allied grand army recovered, by the victory of Bar-sur-Aube, all the territory which they had yielded up in consequence of Buonaparte's success at Montereau. They once more threatened to descend the Seine upon Paris, being entitled to despise any opposition offered by a feeble line, which Macdonald, Oudinot, and Gerard, endeavoured to defend on the left bank. But Schwartzenberg's confidence in his position was lowered, when he heard that Napoleon had taken Rheims; and that, on the evening of the 17th, Ney, with a large division, had occupied Chalons-sur-Marne. This intelligence made a deep impression on the Austrian council of war. Their tactics being rigidly those of the old school of war, they esteemed their army turned whenever a French division occupied such a post as interposed betwixt them and their allies. This, indeed, is in one sense true; but it is equally true, that every division so interposed is itself liable to be turned, if the hostile divisions betwixt which it is interposed take combined measures for attacking it. The catching, therefore, too prompt an alarm, or considering the consequences of such a movement as irretrievable, belongs to the pedantry of war, and not to its science. At midnight a council was held for the purpose of determining the future motions of the allies. The generalissimo recommended a retreat behind the line of the Aube. The Emperor Alexander opposed this with great steadiness. He observed, with justice, that the protracted war was driving the country people to despair, and that the peasantry were already taking up arms, while the allies only wanted resolution, certainly neither opportunity nor numbers, to decide the affair by a single blow.