Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
Hannibal in Gaul - Scipio at Massilia - Passage of the Rhone
Arrived at the Pyrenees, Hannibal sent home a portion of his troops; a measure which he had resolved on from the first with the view of showing to the soldiers how confident their general was of success, and of checking the feeling that his enterprise was one of those from which there is no return home.
With an army of 50,000 infantry and 9000 cavalry, entirely veteran soldiers, he crossed the Pyrenees without difficulty, and then took the coast route by Narbonne and Nimes through the Celtic territory, which was opened to the army partly by the connections previously formed, partly by Carthaginian gold, partly by arms. It was not till it arrived in the end of July at the Rhone opposite Avignon, that a serious resistance appeared to await it.
The consul Scipio, who on his voyage to Spain had landed at Massilia (about the end of June), had there been informed that he had come too late and that Hannibal had crossed not only the Ebro but the Pyrenees.
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Reference address : https://www.ellopos.net/elpenor/rome/3-04-hamilcar-hannibal.asp?pg=39