Polybius Discounts Hannibal's Achievement in Crossing the Alps

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[3.48] They, in fact, represent Hannibal, when at the height of his expectation of success, doing what those would hardly do who have utterly failed and have been reduced to despair,—that is, to entrust themselves and their forces to an unknown country. And so, too, what they say about the desolation of the district, and its precipitous and inaccessible character, only serves to bring their untrustworthiness into clearer light. For first, they pass over the fact that the Celts of the Rhone valley had on several occasions before Hannibal came, and that in very recent times, crossed the Alps with large forces, and fought battles with the Romans in alliance with the Celts of the valley of the Padus, as I have already stated. And secondly, they are unaware of the fact that a very numerous tribe of people inhabit the Alps. Accordingly in their ignorance of these facts they take refuge in the assertion that a hero showed Hannibal the way.

— Polybius, Histories 3.48.6 (translated by E.S. Shuckburgh)