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
Arpi Acquired by the Romans
In the following year (541) the Romans recovered the rich and important Arpi, whose citizens, after the Roman soldiers had stolen into the town, made common cause with them against the Carthaginian garrison.
In general the bonds of the symmachy formed by Hannibal were relaxing; a number of the leading Capuans and several of the Bruttian towns passed over to Rome; even a Spanish division of the Phoenician army, when informed by Spanish emissaries of the course of events in their native land, passed from the Carthaginian into the Roman service.
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Reference address : https://www.ellopos.net/elpenor/rome/3-06-war-hannibal-cannae-zama.asp?pg=53