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 in Lower Italy - Fabius
He had calculated correctly, when he chose this time for remodelling his infantry. The surprise of his antagonists, who were in constant expectation of an attack on the capital, allowed him at least four weeks of undisturbed leisure for the execution of the unprecedentedly bold experiment of changing completely his military system in the heart of a hostile country and with an army still comparatively small, and of attempting to oppose African legions to the invincible legions of Italy. But his hope that the confederacy would now begin to break up was not fulfilled.
In this respect the Etruscans, who had carried on their last wars of independence mainly with Gallic mercenaries, were of less moment; the flower of the confederacy, particularly in a military point of view, consisted--next to the Latins--of the Sabellian communities, and with good reason Hannibal had now come into their neighbourhood. But one town after another closed its gates; not a single Italian community entered into alliance with the Phoenicians. This was a great, in fact an all-important, gain for the Romans.
Nevertheless it was felt in the capital that it would be imprudent to put the fidelity of their allies to such a test, without a Roman army to keep the field. The dictator Quintus Fabius combined the two supplementary legions formed in Rome with the army of Ariminum, and when Hannibal marched past the Roman fortress of Luceria towards Arpi, the Roman standards appeared on his right flank at Aeca.
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Reference address : https://www.ellopos.net/elpenor/rome/3-05-war-hannibal-cannae.asp?pg=21