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

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The following night a murderous outbreak took place amongst the Gaulish auxiliaries in the Roman camp; there was, however, more excitement and confusion than actual loss of life. [2] About 2000 infantry and 200 horsemen massacred the sentinels and deserted to Hannibal. The Carthaginian gave them a kind reception and sent them to their homes with the promise of great rewards if they would enlist the sympathies of their countrymen on his behalf. [3] Scipio saw in this outrage a signal of revolt for all the Gauls, who, infected by the madness of this crime, would at once fly to arms, and though still suffering severely from his wound, he left his position in the fourth watch of the following night, [4??] his army marching in perfect silence, and shifted his camp close to the Trebia on to higher ground where the hills were impracticable for cavalry. He was less successful in escaping the notice of the enemy than he had been at the Ticinus, Hannibal sent first the Numidians, then afterwards the [5??] whole of his cavalry in pursuit and would have inflicted disaster upon the rear of the column at all events, had not the Numidians been tempted by their desire for plunder to turn aside to the deserted Roman camp. [6] Whilst they were wasting their time in prying into every corner of the camp, without finding anything worth waiting for, the enemy slipped out of their hands, and when they caught sight of the Romans they had already crossed the Trebia and were measuring out the site for their camp. A few stragglers whom they caught on their side the river were killed. [7] Unable any longer to endure the irritation of his wound, which had been aggravated during the march, and also thinking that he ought to wait for his colleague-he had already heard that he had been recalled from Sicily-Scipio selected what seemed the safest position near the river, and formed a standing camp which was strongly entrenched. [8] Hannibal had encamped not far from there, and in spite of his elation at his successful cavalry action he felt considerable anxiety at the shortness of supplies which, owing to his marching through hostile territory where no stores were provided, became more serious day by day. [9] He sent a detachment to the town of Clastidium where the Romans had accumulated large quantities of corn. Whilst they were preparing to attack the place they were led to hope that it would be betrayed to them. Dasius, a Brundisian, was commandant of the garrison, and he was induced by a moderate bribe of 400 gold pieces to betray Clastidium to Hannibal. [10] The place was the granary of the Carthaginians while they were at the Trebia. No cruelty was practiced on the garrison, as Hannibal was anxious to win a reputation for clemency at the outset.