The Emperor was much discouraged. He had put forth his full strength, exposed his own person to the hottest fire, so as to encourage his men, and yet failed to prevent the union of the allied armies, or to hold the line of the River Aube. Early on the morrow he left the castle of Brienne, and took the road for Troyes; while Marmont, with a corps now reduced to less than 3,000 men, bravely defended the passage of the Voire at Rosnay, and, after delaying the pursuit, took post at Arcis-sur-Aube. The means of defence, both moral and material, seemed wellnigh exhausted. When, on February 3rd, Napoleon entered Troyes, scarcely a single _vivat_ was heard. Even the old troops were cast down by defeat and hunger, while as many as 6,000 conscripts are said to have deserted. The inhabitants refused to supply the necessaries of life except upon requisition. "The army is perishing of famine," writes the Emperor at Troyes. Again at Nogent: "Twelve men have died of hunger, though we have used fire and sword to get food on our way here." And, now, into the space left undefended between the Marne and the Aube, Blücher began to thrust his triumphant columns, with no barrier to check him until he neared the environs of Paris. Once more the Prussian and Russian officers looked on the war as over, and invited one another to dinner at the Palais-Royal in a week's time.[403] But it was on this confidence of the old hussar-general that Napoleon counted. He knew his proneness to daring movements, and the strong bias of Schwarzenberg towards delay: he also divined that they would now separate their forces, Blücher making straight for Paris, while other columns would threaten the capital by way of Troyes and Sens. That was why he fell back on Troyes, so as directly to oppose the latter movement, "or so as to return and manoeuvre against Blücher and stay his march."[404] Another motive was his expectation of finding at Nogent the 15,000 veterans whom he had ordered Soult to send northwards. And doubtless the final reason was his determination to use the sheltering curve of the Seine, which between Troyes and Nogent flows within twenty miles of the high-road that Blücher must use if he struck at Paris. At many a crisis Napoleon had proved the efficacy of a great river line. From Rivoli to Friedland his career abounds in examples of riverine tactics. The war of 1813 was one prolonged struggle for the line of the Elbe. He still continued the war because he could not yet bring himself to sign away the Rhenish fortresses: and he now hoped to regain that "natural boundary" by blows showered on divided enemies from behind the arc of the Seine. With wonderful prescience he had guessed at the general plan of the allies. But he could scarcely have dared to hope that on that very day (February 2nd) they were holding a council of war at Brienne, and formally resolved that Blücher should march north-west on Paris with about 50,000 men, while the allied Grand