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
After it had lasted a while, the Campanian Greeks became weary of the disturbance of their commerce and of the foreign garrison; and the Romans, whose whole efforts were directed to keep states of the second and third rank by means of separate treaties aloof from the coalition which was about to be formed, hastened, as soon as the Greeks consented to negotiate, to offer them the most favourable terms--full equality of rights and exemption from land service, equal alliance and perpetual peace. Upon these conditions, after the Neapolitans had rid themselves of the garrison by stratagem, a treaty was concluded (428).
The Sabellian towns to the south of the Volturnus, Nola, Nuceria, Herculaneum, and Pompeii, took part with Samnium in the beginning of the war; but their greatly exposed situation and the machinations of the Romans--who endeavoured to bring over to their side the optimate party in these towns by all the levers of artifice and self-interest, and found a powerful support to their endeavours in the precedent of Capua--induced these towns to declare themselves either in favour of Rome or neutral not long after the fall of Neapolis.
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Reference address : https://www.ellopos.net/elpenor/rome/2-06-italians-rome.asp?pg=7