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

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Gladdened by this vision he proceeded to cross the Ebro, with his army in three divisions, after sending men on in advance to secure by bribes the good-will of the Gauls dwelling about his crossing-place, and also to reconnoitre the passes of the Alps. He brought 90,000 infantry and 12,000 cavalry over the Ebro. [2] His next step was to reduce to submission the Ilergetes, the Bargusii, and the Ausetani, and also the district of Lacetania, which lies at the foot of the Pyrenees. [3] He placed Hanno in charge of the whole coast-line to secure the passes which connect Spain with Gaul, and furnished him with an army of 10,000 infantry to hold the district, and 1000 cavalry. [4] When his army commenced the passage of the Pyrenees and the barbarians found that there was truth in the rumour that they were being led against Rome, 3000 of the Carpetani deserted. It was understood that they were induced to desert not so much by the prospect of the war as by the length of the march and the impossibility of crossing the Alps. [5] As it would have been hazardous to recall them, or to attempt to detain them by force, in case the quick passions of the rest of the army should be roused, Hannibal sent back to their homes more than [6??] 7000 men who, he had personally discovered, were getting tired of the campaign, and at the same time he gave out that the Carpetani had also been sent back by him.