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
While the Scipios thus almost dislodged the Carthaginians from Spain, they knew how to raise up a dangerous enemy to them in western Africa itself in the person of the powerful west African prince Syphax, ruling in the modern provinces of Oran and Algiers, who entered into connections with the Romans (about 541). Had it been possible to supply him with a Roman army, great results might have been expected; but at that time not a man could be spared from Italy, and the Spanish army was too weak to be divided.
Nevertheless the troops belonging to Syphax himself, trained and led by Roman officers, excited so serious a ferment among the Libyan subjects of Carthage that the lieutenant-commander of Spain and Africa, Hasdrubal Barcas, went in person to Africa with the flower of his Spanish troops. His arrival in all likelihood gave another turn to the matter; the king Gala--in what is now the province of Constantine--who had long been the rival of Syphax, declared for Carthage, and his brave son Massinissa defeated Syphax, and compelled him to make peace.
Little more is related of this Libyan war than the story of the cruel vengeance which Carthage, according to her wont, inflicted on the rebels after the victory of Massinissa.
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Reference address : https://www.ellopos.net/elpenor/rome/3-06-war-hannibal-cannae-zama.asp?pg=32