On the 24th March, Napoleon halted at Doulevent, to concentrate his forces, and gain intelligence. He remained there also on the 25th, and employed his time in consulting his maps, and dictating new instructions for Caulaincourt, by which he empowered him to make every cession. But the hour of safety was past. Upon the morning of the 26th, Napoleon was roused by the intelligence, that the allies had attacked the rear of his army under Macdonald, near St. Dizier. He instantly hastened to the support of the maréchal, concluding that his own scheme had been successful, and that his retreat to the eastward had drawn after him the grand army of the allies. The allies showed a great number of cavalry with flying guns, but no infantry. Napoleon ordered an attack on them, in which the French were successful, the allies falling back after slight opposition. He learned from the prisoners, that he had been engaged, not with Schwartzenberg, but with Blucher's troops. This was strange intelligence. He had left Blucher threatening Meaux, and now he found his army on the verge of Lorraine. On the 27th, by pushing a reconnoitring party as far west as Vitry, Napoleon learned the real state of the case; that both the allied armies had marched upon Paris; and that the cavalry with which he had skirmished were 10,000 men, under Winzengerode, left behind by the allies as a curtain to screen their motions, and engage his attention. Every word in this news had a sting in it. To hasten after the allies, to surprise them, if possible, ere the cannon on Montmartre were yet silenced, was the most urgent thought that ever actuated the mind even of Napoleon, so accustomed to high and desperate risks. But the direct route on Paris had been totally exhausted of provision, by the march and countermarch of such large armies. It was necessary to go round by Troyes, and, for that purpose, to retrograde as far as Doulevent. Here he received a small billet in cipher, from the postmaster-general, La Valette, the first official communication he had got from the capital during ten days. "The partisans of the stranger," these were the contents, "are making head, seconded by secret intrigues. The presence of Napoleon is indispensable, if he desires to prevent his capital from being delivered to the enemy. There is not a moment to be lost."[30] The march was precipitated accordingly. [Sidenote: DOULANCOURT--TROYES.]