Soon after the day began the head of the army entered a dangerous defile, and made its way in a long slender line along the terrace-like path which overhung the valley far below. The route proved comparatively easy for the foot-soldiers, but the cavalry and the baggage-animals only made their way with great difficulty, finding obstacles at almost every step. The sight of the struggling cavalcade was too much for the caution of the natives. Here was abundant plunder at their hands. From many points of the mountain above the road they rushed down upon the Carthaginians, arms in hand. A frightful disorder followed. So narrow was the path that the least confusion was likely to throw the heavily-laden baggage-animals down the precipitous steep. The cavalry horses, wounded by the arrows and javelins of the mountaineers, plunged wildly about and doubled the confusion. It was fortunate for Hannibal that he had taken the precaution of the night before. From the post he had taken with his light troops the whole scene of peril and disorder was visible to his eyes. Charging down the hill, he attacked the mountaineers and drove them from their prey. But it was a dearly bought victory, for the fight on the narrow road increased the confusion, and in seeking the relief of his army he caused the destruction of many of his own men. At length the perilous defile was safely passed, and the army reached a wide and rich valley beyond. Here was the town of Montmelian, the principal stronghold of the mountaineers. This Hannibal took by storm, and recovered there many of his own men, horses, and cattle which the natives had taken, while he found an abundant store of food for the use of his weary soldiers. After a day's rest here the march was resumed. During the next three days the army moved up the valley of the river Isere without difficulty. The natives met them with wreaths on their heads and branches in their hands, promising peace, offering hostages, and supplying cattle. Hannibal mistrusted the sudden friendliness of his late foes, but they seemed so honest that he accepted some of them as guides through a difficult region which he was now approaching. He had reason for his mistrust, for they treacherously led him into a narrow and dangerous defile, which might have easily been avoided; and while the army was involved in this straitened pass an attack was suddenly made by the whole force of the mountaineers. Climbing along the mountain-sides above the defile, they hurled down stones on the entangled foe, and loosened and rolled great rocks down upon their defenceless heads.