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
Clupea, for example, repulsed him, and he was obliged to retire in disgrace from Hippo Diarrhytus, after having lost the whole summer in front of it and having had his besieging apparatus twice burnt. Neapolis was no doubt taken; but the pillage of the town in opposition to his pledged word of honour was not specially favourable to the progress of the Roman arms. The courage of the Carthaginians rose.
Bithyas, a Numidian sheik, passed over to them with 800 horse; Carthaginian envoys were enabled to attempt negotiations with the kings of Numidia and Mauretania and even with Philip the Macedonian pretender.
It was perhaps internal intrigues--Hasdrubal the emigrant brought the general of the same name, who commanded in the city, into suspicion on account of his relationship with Massinissa, and caused him to be put to death in the senate-house--rather than the activity of the Romans, that prevented things from assuming a turn still more favourable for Carthage.
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Reference address : https://www.ellopos.net/elpenor/rome/4-01-gracchi.asp?pg=56