On the 17th Lannes arrived at Chatillon, where he attacked and defeated a corps of 5000 Austrians--who received the onset of a French division in that quarter, with about as much surprise as if an enemy had dropped on them from the clouds. Every difficulty now seemed to be surmounted, and corps after corps came down into the plentiful and verdant valley, full of joy. But suddenly the march of the vanguard was arrested by an obstacle unforeseen, or, at least, grievously under-estimated. Midway between Aosta and Ivrea the Dora flows through a defile, not more than fifty yards in width: the heights on either hand rise precipitous; and in the midst an abrupt conical rock, crowned with the fortress of St. Bard, entirely commands the river, and a small walled town, through the heart of which lies the only passage. Lannes having vainly attempted to force the place by a _coup de main_, a panic arose, and this spreading to the rear, orders were given for stopping the descent of the artillery. The Consul had come as far as the town of Aosta when this intelligence reached him. He immediately hastened to St. Bard, where he found the troops in much confusion. On occasions like this Napoleon rarely failed to vindicate the _prestige_ of his reputation. After hastily surveying the localities, he climbed the height of the Albaredo, which rises on the one side above the fort, and satisfied himself that, though the path had hitherto been trodden only by solitary huntsmen, the army who had crossed the St. Bernard might, by similar efforts, find or make their way here also. A single cannon being, with the last difficulty, hoisted to the summit, he planted it so as to play full on the chief bastion of St. Bard. The moment this was arranged the troops began their painful march; and they accomplished it without considerable loss; for the Consul's gun was so excellently placed that the main battery of the subjacent castle, was, ere long, silenced. The men crept along the brow of the Albaredo in single file, each pausing (says an eye-witness) to gaze for a moment on Napoleon, who, overcome with his exertions, had lain down and fallen fast asleep upon the summit of the rock. Thus passed the main body, slowly, but surely. Meantime Colonel Dufour had been ordered to scale the wall of the town at nightfall; and his regiment (the 58th) performed this service so impetuously, that the Austrian troops took refuge in the castle, and the French made good their lodgment in the houses below. For some hours the garrison poured down grape-shot at half-musket distance upon the French, but at last out of compassion for the inhabitants, the fire slackened, and ere day broke Buonaparte had effected his main purpose. The streets of the town having been strewn with litter to deafen sound, the guns, covered with straw and branches of trees, were dragged through it under the very guns of St. Bard, and without exciting the least suspicion in its garrison. Next morning the Austrian sent on