Appian Recounts Hannibal's Crossing of the Alps

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What Hannibal himself and what the other Carthaginian and Roman generals after him did in Spain, I have related in the Spanish history. [218] Having collected a large army of Celtiberians, Africans, and other nationalities, and put the command of Spain in the hands of his brother Hasdrubal, he crossed over the Pyrenees mountains into the country of the Celts, which is now called Gaul, with 90,000 foot, 12,000 horse, and 37 elephants. He passed through the country of the Gauls, conciliating some with money and some by persuasion, and overcoming others by force.  When he came to the Alps and found no road through or over them (for they were exceedingly precipitous), he nevertheless marched boldly forward, but suffered great losses. [more...] The snow and ice being heaped high in front, he cut down and burned wood, quenched the ashes with water and vinegar, and thus rendering the rocks brittle he shattered them with iron hammers and opened a passage which is still in use over the mountains and is called Hannibal's pass. As his supplies began to fail he pressed forward, the Romans remaining in ignorance until he was actually in Italy. Scarcely six months after leaving Spain, and after suffering heavy losses of men, he descended from the mountains to the plain.  [§5] After a brief pause he attacked Taurasia, a Gallic town, took it by storm, and put the prisoners to death, in order to strike terror into the rest of the Gauls. Then he advanced to the river Eridanus, now called the Padus [Po], where the Romans were at war with the Gallic tribe called the Boii, and pitched his camp.

— Appian, Roman History 7.1.4 (translated by H. White)