Beaulieu, who had his headquarters at Valeggio, a village nearly opposite to Borghetto, hastened to retreat, and evacuating Peschiera, marched his dismayed forces behind the Adige, leaving five hundred prisoners, with other trophies of victory, in the hands of the French. Buonaparte had designed that this day of success should have been still more decisive; for he meditated an attack upon Peschiera at the moment when the passage at Borghetto was accomplished; but ere Augereau, to whom this manœuvre was committed, had time to approach Peschiera, it was evacuated by the Austrians, who were in full retreat by Castel Nuovo, protected by their cavalry.[153] The left of the Austrian line, cut off from the centre by the passage of the French, had been stationed at Puzzuolo, lower on the Mincio. When Sebottendorf, who commanded the Imperial troops stationed on the left bank, heard the cannonade, he immediately ascended the river, to assist his commander-in-chief to repel the French, or to take them in flank if it was already crossed. The retreat of Beaulieu made both purposes impossible; and yet this march of Sebottendorf had almost produced a result of greater consequence than would have been the most complete victory. The French division which first crossed the Mincio, had passed through Valeggio without halting, in pursuit of Beaulieu, by whom the village had been just before abandoned. Buonaparte with a small retinue remained in the place, and Massena's division were still on the right bank of the Mincio, preparing their dinner. At this moment the advanced guard of Sebottendorf, consisting of hulans and hussars, pushed into the village of Valeggio. There was but barely time to cry to arms, and, shutting the gates of the inn, to employ the general's small escort in its defence, while Buonaparte, escaping by the garden, mounted his horse and galloped towards Massena's division. The soldiers threw aside their cookery, and marched instantly against Sebottendorf, who, with much difficulty, and not without loss, effected a retreat in the same direction as his commander-in-chief Beaulieu. This personal risk induced Buonaparte to form what he called the corps of guides, veterans of ten years' service at least, who were perpetually near his person, and, like the _Triarii_ of the Romans, were employed only when the most desperate efforts of courage were necessary. Bessières, afterwards Duke of Istria, and Marshal of France, was placed at the head of this chosen body, which gave rise to the formation of the celebrated Imperial Guards of Napoleon.[154] [Sidenote: FORTRESS OF MANTUA.]