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
Inaction of the Samnites
As a matter of course, the Samnites could not behold the threatening progress of the Romans with satisfaction, and they probably put obstacles in its way; nevertheless they neglected to intercept the new career of conquest, while there was still perhaps time to do so, with that energy which the circumstances required. They appear indeed in accordance with their treaty with Rome to have occupied and strongly garrisoned Teanum; for while in earlier times that city sought help against Samnium from Capua and Rome, in the later struggles it appears as the bulwark of the Samnite power on the west.
They spread, conquering and destroying, on the upper Liris, but they neglected to establish themselves permanently in that quarter. They destroyed the Volscian town Fregellae--by which they simply facilitated the institution of the Roman colony there which we have just mentioned --and they so terrified two other Volscian towns, Fabrateria (Ceccano) and Luca (site unknown), that these, following the example of Capua, surrendered themselves to the Romans (424).
The Samnite confederacy allowed the Roman conquest of Campania to be completed before they in earnest opposed it; and the reason for their doing so is to be sought partly in the contemporary hostilities between the Samnite nation and the Italian Greeks, but principally in the remiss and distracted policy which the confederacy pursued.
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Reference address : https://www.ellopos.net/elpenor/rome/2-05-subjugation-latins-campanians.asp?pg=35