Titus Livius (Livy), The History of Rome, Book 21
Rev. Canon Roberts, Ed.

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Hannibal's men, meanwhile, had made fires in front of their tents, oil had been distributed amongst the maniples for them to make their joints and limbs supple and they had time for an ample repast. When it was announced that the enemy had crossed the river they took their arms, feeling alert and active in mind and body, and marched to battle. [2] The Balearic and light-armed infantry were posted in front of the standards; they numbered about 8000; behind them the heavy-armed infantry, the mainstay and backbone of the army; on the flanks Hannibal distributed the cavalry, and outside them, again, the elephants. [3] When the consul saw his cavalry, who had lost their order in the pursuit, suddenly meeting with an unsuspected resistance from the Numidians, he recalled them by signal and received them within his infantry. [4] There were 18,000 Romans, 20,000 Latin allies, and an auxiliary force of Cenomani, the only Gallic tribe which had remained faithful. These were the forces engaged. [5] The Balearics and light infantry opened the battle, but on being met by the heavier legions they were rapidly withdrawn to the wings, an evolution which at once threw the Roman horse into difficulties, for the 4000 wearied troopers had been unable to offer an effective resistance to 10,000 who [6??] were fresh and vigorous, and now in addition they were overwhelmed by what seemed a cloud of missiles from the light infantry. [7] Moreover, the elephants, towering aloft at the ends of the line, terrified the horses not only by their appearance but by their unaccustomed smell, and created widespread panic. The infantry battle, as far as the Romans were concerned, was maintained more by courage than by physical [8??] strength, for the Carthaginians, who had shortly before been getting themselves into trim, brought their powers fresh and unimpaired into action, whilst the Romans were fatigued and hungry and stiff with cold. Still, their courage would have kept them up had it been only infantry that they were fighting against. [9] But the light infantry, after repulsing the cavalry, were hurling their missiles on the flanks of the legions; the elephants had now come up against the centre of the Roman line, and Mago and his Numidians, as soon as it had passed their ambuscade, rose up in the rear and created a terrible disorder and panic. [10] Yet in spite of all the dangers which surrounded them, the ranks stood firm and immovable for some time, even, contrary to all expectation, against the elephants. [11] Some skirmishers who had been placed where they could attack these animals flung darts at them and drove them off, and rushed after them, stabbing them under their tails, where the skin is soft and easily penetrated.