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
Italian War - Position of the Armies
While the war was thus terminated in Sicily by Marcellus, in Greece by Publius Sulpicius, and in Spain by Scipio, the mighty struggle went on without interruption in the Italian peninsula. There after the battle of Cannae had been fought and its effects in loss or gain could by degrees be discerned, at the commencement of 540, the fifth year of the war, the dispositions of the opposing Romans and Phoenicians were the following. North Italy had been reoccupied by the Romans after the departure of Hannibal, and was protected by three legions, two of which were stationed in the Celtic territory, the third as a reserve in Picenum.
Lower Italy, as far as Mount Garganus and the Volturnus, was, with the exception of the fortresses and most of the ports, in the hands of Hannibal. He lay with his main army at Arpi, while Tiberius Gracchus with four legions confronted him in Apulia, resting upon the fortresses of Luceria and Beneventum. In the land of the Bruttians, where the inhabitants had thrown themselves entirely into the arms of Hannibal, and where even the ports--excepting Rhegium, which the Romans protected from Messana--had been occupied by the Phoenicians, there was a second Carthaginian army under Hanno, which in the meanwhile saw no enemy to face it.
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Reference address : https://www.ellopos.net/elpenor/rome/3-06-war-hannibal-cannae-zama.asp?pg=49