The army now pressed forward, with great alacrity, along the banks of the Aosta. They were threading a beautiful valley, rich in verdure and blooming beneath the sun of early spring. Cottages, vineyards, and orchards, in full bloom, embellished their path, while upon each side of them rose, in majestic swell, the fir-clad sides of the mountains. The Austrians pressing against the frontiers of France, had no conception of the storm which had so suddenly gathered, and which was, with resistless sweep, approaching their rear. The French soldiers, elated with the Herculean achievement they had accomplished, and full of confidence in their leader, pressed gayly on. But the valley before them began to grow more and more narrow. The mountains, on either side, rose more precipitous and craggy. The Aosta, crowded into a narrow channel, rushed foaming over the rocks, leaving barely room for a road along the side of the mountain. Suddenly the march of the whole army was arrested by a fort, built upon an inaccessible rock, which rose pyramidally from the bed of the stream. Bristling cannon, skillfully arranged on well-constructed bastions, swept the pass, and rendered further advance apparently impossible. Rapidly the tidings of this unexpected obstruction spread from the van to the rear. Napoleon immediately hastened to the front ranks. Climbing the mountain opposite the fort, by a goat path, he threw himself down upon the ground, when a few bushes concealed his person from the shot of the enemy, and with his telescope long and carefully examined the fort and the surrounding crags. He perceived one elevated spot, far above the fort, where a cannon might by possibility be drawn. From that position its shot could be plunged upon the unprotected bastions below. Upon the face of the opposite cliff, far beyond the reach of cannon-balls, he discerned a narrow shelf in the rock by which he thought it possible that a man could pass. The march was immediately commenced, in single file, along this giddy ridge. And even the horses, inured to the terrors of the Great St. Bernard, were led by their riders upon the narrow path, which a horse's hoof had never trod before, and probably will never tread again. The Austrians, in the fort, had the mortification of seeing thirty-five thousand soldiers, with numerous horses, defile along this airy line, as if adhering to the side of the rock. But neither bullet nor ball could harm them. [Illustration: PASSING THE FORT OF BARD.]