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
Thus compelled to beg or to buy from the lukewarm and venal multitude the permission to save it; compelled to bargain with the arrogance of men whom he hated and whom he had constantly conquered, at the price of humiliation and of silence, for the respite indispensable for his ends; compelled to conceal from those despised traitors to their country, who called themselves the lords of his native city, his plans and his contempt--the noble hero stood with few like-minded friends between enemies without and enemies within, building upon the irresolution of the one and of the other, at once deceiving both and defying both, if only he might gain means, money, and men for the contest with a land which, even were the army ready to strike the blow, it seemed difficult to reach and scarce possible to vanquish.
He was still a young man, little beyond thirty, but he had apparently, when he was preparing for his expedition, a foreboding that he would not be permitted to attain the end of his labours, or to see otherwise than afar off the promised land. When he left Carthage he enjoined his son Hannibal, nine years of age, to swear at the altar of the supreme God eternal hatred to the Roman name, and reared him and his younger sons Hasdrubal and Mago--the "lion's brood," as he called them--in the camp as the inheritors of his projects, of his genius, and of his hatred.
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Reference address : https://www.ellopos.net/elpenor/rome/3-04-hamilcar-hannibal.asp?pg=12