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
Not only did the chain of Roman fortresses everywhere cut the nerves and sinews of the land, but the Roman rule, continued for many years, had rendered the inhabitants unused to arms--they furnished only a moderate contingent to the Roman armies--had appeased their ancient hatred, and had gained over a number of individuals everywhere to the interest of the ruling community.
They joined the conqueror of the Romans, indeed, after the cause of Rome seemed fairly lost, but they felt that the question was no longer one of liberty; it was simply the exchange of an Italian for a Phoenician master, and it was not enthusiasm, but despair that threw the Sabellian communities into the arms of the victor. Under such circumstances the war in Italy flagged.
Hannibal, who commanded the southern part of the peninsula as far up as the Volturnus and Garganus, and who could not simply abandon these lands again as he had abandoned that of the Celts, had now likewise a frontier to protect, which could not be left uncovered with impunity; and for the purpose of defending the districts that he had gained against the fortresses which everywhere defied him and the armies advancing from the north, and at the same time of resuming the difficult offensive against central Italy, his forces--an army of about 40,000 men, without reckoning the Italian contingents--were far from sufficient.
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Reference address : https://www.ellopos.net/elpenor/rome/3-06-war-hannibal-cannae-zama.asp?pg=2