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 tribes. Hannibal's army had been the first body of regular troops that had ever traversed their regions; and, as wild animals assail a traveller, the natives rose against it instinctively, in imagined defence of their own habitations, which they supposed to be the objects of Carthaginian ambition. But the fame of the war, with which Italy had now been convulsed for twelve years, had penetrated into the Alpine passes; and the mountaineers now understood that a mighty city southward of the Alps, was to be attacked by the troops whom they saw marching among them. They now not only opposed no resistance to the passage of Hasdrubal, but many of them, out of the love of enterprise and plunder, or allured by the high pay that he offered, took service with him; and thus he advanced upon Italy with an army that gathered strength at every league. It is said, also, that some of the most important engineering works which Hannibal had constructed were found by Hasdrubal still in existence, and materially favoured the speed of his advance. He thus emerged into Italy from the Alpine valleys much sooner than had been anticipated. Many warriors of the Ligurian tribes joined him: and, crossing the river Po, he marched down its southern bank to the city of Placentia, which he wished to secure as a base for his future operations.