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
War between Massinissa and Carthage
The desired occasion was soon found. The provoking violations of right on the part of Massinissa and the Romans brought to the helm in Carthage Hasdrubal and Carthalo, the leaders of the patriotic party, which was not indeed, like the Achaean, disposed to revolt against the Roman supremacy, but was at least resolved to defend, if necessary, by arms against Massinissa the rights belonging by treaty to the Carthaginians.
The patriots ordered forty of the most decided partisans of Massinissa to be banished from the city, and made the people swear that they would on no account ever permit their return; at the same time, in order to repel the attacks that might be expected from Massinissa, they formed out of the free Numidians a numerous army under Arcobarzanes, the grandson of Syphax (about 600). Massinissa, however, was prudent enough not to take arms now, but to submit himself unconditionally to the decision of the Romans respecting the disputed territory on the Bagradas; and thus the Romans could assert with some plausibility that the Carthaginian preparations must have been directed against them, and could insist on the immediate dismissal of the army and destruction of the naval stores.
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Reference address : https://www.ellopos.net/elpenor/rome/4-01-gracchi.asp?pg=38