The active invention of Buonaparte, sure as he was to be seconded by the zeal and rapidity of the French army, speedily devised the means to draw advantage from this dislocation of the Austrian forces. He resolved not to await the arrival of Wurmser and Melas, but, concentrating his whole strength, to march into the valley of Chiese, and avail himself of the local superiority thus obtained, to attack and overpower the Austrian division left under Quasdonowich, who was advancing on Brescia, down the eastern side of the lake. For this purpose one great sacrifice was necessary. The plan inevitably involved the raising of the siege of Mantua. Napoleon did not hesitate to relinquish this great object, at whatever loss, as it was his uniform system to sacrifice all secondary views, and to incur all lesser hazards, to secure what he considered as the main object of the campaign. Serrurier, who commanded the blockading army, was hastily ordered to destroy as much as possible of the cannon and stores which had been collected with so much pains for the prosecution of the siege.[171] A hundred guns were abandoned in the trenches, and Wurmser, on arriving at Mantua, found that Buonaparte had retired with a precipitation resembling that of fear.[172] On the night of the 31st July this operation took place, and, leaving the division of Augereau at Borghetto, and that of Massena at Peschiera, to protect, while it was possible, the line of the Mincio, Buonaparte rushed, at the head of an army which his combinations had rendered superior, upon the right wing of the Austrians, which had already directed its march to Lonato, near the bottom of the lago di Guarda, in order to approach the Mincio, and resume its communication with Wurmser. But Buonaparte, placed by the celerity of his movements between the two hostile armies, defeated one division of the Austrian right at Salo, upon the lake, and another at Lonato. At the same time, Augereau and Massena, leaving just enough of men at their posts of Borghetto and Peschiera to maintain a respectable defence against Wurmser, made a forced march to Brescia, which they supposed to be still occupied by a third division of the Austrian right wing. But that body, finding itself insulated, and conceiving that the whole French army was debouching on them from different points, was already in full retreat towards the Tyrol, from which it had advanced with the expectation of turning Buonaparte's flank, and destroying his retreat upon Milan. Some French troops were left to accelerate their flight, and prevent their again making head, while Massena and Augereau, rapidly countermarching, returned to the banks of the Mincio to support their respective rear-guards, which they had left at Borghetto and Peschiera, on the line of that river. [Sidenote: BATTLE OF LONATO.]