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
Conquests of the Samnites in the South of Italy
The Samnite nation, which, at the time of the expulsion of the Tarquins from Rome, had doubtless already been for a considerable period in possession of the hill-country which rises between the Apulian and Campanian plains and commands them both, had hitherto found its further advance impeded on the one side by the Daunians --the power and prosperity of Arpi fall within this period--on the other by the Greeks and Etruscans. But the fall of the Etruscan power towards the end of the third, and the decline of the Greek colonies in the course of the fourth century, made room for them towards the west and south; and now one Samnite host after another marched down to, and even moved across, the south Italian seas.
They first made their appearance in the plain adjoining the bay, with which the name of the Campanians has been associated from the beginning of the fourth century; the Etruscans there were suppressed, and the Greeks were confined within narrower bounds; Capua was wrested from the former (330), Cumae from the latter (334). About the same time, perhaps even earlier, the Lucanians appeared in Magna Graecia: at the beginning of the fourth century they were involved in conflict with the people of Terina and Thurii; and a considerable time before 364 they had established themselves in the Greek Laus. About this period their levy amounted to 30,000 infantry and 4000 cavalry.
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Reference address : https://www.ellopos.net/elpenor/rome/2-05-subjugation-latins-campanians.asp?pg=23