“This being speedily done, and the men in the boats working with keen rivalry and shouting and striving against the force of the current, ... the barbarians in front raised their war-song and their challenges. The scene was one of terror and of incitement to the conflict.
“At this moment the Carthaginians, who had first crossed to that side of the river, suddenly and unexpectedly appeared among the tents of the barbarians, which had been left vacant. Some set fire to the encampment; while the majority rushed upon those that were guarding the passage of the river. In view of an event so utterly unexpected the barbarians ran, some to protect their tents, others to resist the assailants, and fought with them. Hannibal, now that everything had succeeded in accordance with his plan, straightway drew up those that had first got across, encouraged them, and engaged in battle with the barbarians. The Gauls, from their lack of order and the strangeness of all that had taken place, soon turned and betook themselves to headlong flight.
“The Carthaginian general having conquered both the passage and his enemies, immediately attended to the transport of those that still remained on the other shore....
“The transport of the elephants was effected in the following manner:—Having constructed a number of rafts, they strongly joined together two of these, so as to fit closely one with the other, and planted both firmly in the shore at the place of embarcation, the two together being about fifty feet wide. Then, joining other rafts together in the same way, they attached these to the former at the outer end, carrying the fabric of the bridge forward in the line of passage; and, that the whole structure might not be carried down the river, the side that was against the stream they secured by cables from the land, fastened to some trees which grew on the brink. When they had thrown out this bridge to the length of two plethra [sixty meters] altogether, they added at the end two rafts constructed more perfectly than the others and the largest of all. These were bound with great strength to each other; but to the rest in such a way that the fastenings could be easily severed. To these they fixed a number of towing-lines with which the barges were to prevent their being carried down the river, and hold them by force against the stream, to take over the elephants upon them and land them upon the other side.
“After this, they dug up and brought a quantity of earth to all the rafts, and spread it till it was level with, and looked just like, the road that led over the dry land to the crossing-place. The elephants were used always to obey the Indians as far as the edge of the water, but never as yet had ventured to go into the water. They brought them, therefore, along this bank of earth, putting two females first; and the beasts obeyed them. As soon as they had got them on to the farthest rafts, they cut away the fastenings by which these were fitted to the rest, and, pulling on the two lines with the barges, they soon carried away the beasts and the rafts which bore them from the earthy pier. At this the animals, quite confounded, turned about and rushed in every direction; but, surrounded on every side by the stream, they shrank from it, and were compelled to stay where they were; and, in this way, the two rafts being brought back repeatedly, most of the elephants were brought over upon them. But some, through fright, leaped into the river half-way across; and it happened that all the Indians belonging to these were lost, but the elephants were saved, for, with the power and size of their probosces, raising them out of the water and breathing through them and spouting up all that got into them, they held out, making their way for the most part erect below the water....”
Polybius goes on to tell how Hannibal, having got his forces across, marched up into the mountains by the valley of the Rhône and then began the ascent of the Alps. The Allobroges seized the heights. Polybius says:—
“The Carthaginian general, aware that the barbarians had preoccupied the posts of vantage, encamped his army in front of the heights and waited there; then he sent forward some of the Gauls who were acting as guides, in order that they might spy into the designs of the enemy and their whole plan.
“When these men had executed all that was arranged, the general, learning that the enemy steadily kept to their post and watched the passes through the day, but that they went to their repose at night in a neighboring town; acting conformably to that state of things, contrived this scheme:—he put his force in motion and led them forward openly and, when he had come near to the difficult places, he pitched his camp not far from the enemy; but, when night came on, he ordered fires to be kindled, and left the greater part of his troops, and, having lightly armed the most efficient men, he made his way through the defiles in the night and took possession of the positions previously held by the enemy; the barbarians having retired to the town as they were in the habit of doing.
“This had all been done before day came on, and, when the barbarians saw what had happened, they at first abstained from any attack; but later, when they observed the crowd of beasts of burden and the cavalry winding out from the defile with much difficulty and in a long-drawn column, they were encouraged to close in upon the line of march. As the barbarians made their attacks in many places, a great loss ensued to the Carthaginians, chiefly among the horses and beasts of burden, yet not so much from the enemy as from the nature of the ground; for, as the pass was not only narrow and rugged, but also precipitous, at every moment and at every shock numbers of the pack-animals fell with their loads over the cliffs. The shock was caused chiefly by the wounded horses, for some of them, in the panic made by their wounds, dashed against the baggage-animals, others with a rush forward knocked over everything that came in their way in this difficult passage, and completed the immense confusion.