On the 29th of November our united detachments, now numbering several hundred men, arrived at Brunn. I lost no time in repairing to headquarters, where I found General d'Auvergne deeply engaged with the details of the force under his command: his brigade had been placed under the orders of Murat; and it was well known the prince gave little rest or respite to those under his command. From him I learned that three days of unsuccessful negotiation had just passed over, and that the Emperor had now resolved on a great battle. Indeed, every moment was critical. Russia had assumed a decidedly hostile aspect; the Swedes were moving to the south; the Archduke Charles, by a circuitous route, was on the march to join the Russian army, to whose aid fresh reinforcements were daily arriving, and Benningsen was hourly expected with more. Under these circumstances a battle was inevitable; and such a one, as, by its result, must conclude the war. This much did I learn from the old general as we rode over the field together; examining with caution the nature of the ground, and where it offered facilities, and where it presented obstacles, to the movement of cavalry. Such were the orders issued that morning by Napoleon to the generals of brigade, who might now be seen with their staffs traversing the plain in every direction. As we moved along we could discover in the distance the dark columns of the enemy marching, not towards us, but in a southerly direction towards our extreme right. This movement attracted the attention of several others, and more than one aide-de-camp was despatched to Brunn to carry the intelligence to the Emperor. The same evening couriers departed in every direction to Bernadotte and Davoust to hasten forward at once; even Mortier, with his mangled division, was ordered to abandon Vienna to a division of Marmont's army, and move on to Brunn. And now the great work of concentration began. Meanwhile the Russians advanced, and on the 30th drove in an advanced post, and compelled our cavalry to fall back behind our position. The following morning the allies resumed their flank movement. And now no doubt could be entertained of their plan; which was, by turning our right, to cut us off from our supporting columns resting at Vienna, and throw our retreat back upon the mountainous districts of Bohemia. In this way five massive columns moved past us scarce half a league distant from our advanced posts, numbering eighty thousand men, of which fifteen were cavalry in the most perfect condition.