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
Crises within the Romano-Latin League
But the more decided the successes that the league of Romans, Latins, and Hernici achieved against the Etruscans, Aequi, Volsci, and Rutuli, the more that league became liable to disunion. The reason lay partly in the increase of the hegemonic power of Rome, of which we have already spoken as necessarily springing out of the existing circumstances, but which nevertheless was felt as a heavy burden in Latium; partly in particular acts of odious injustice perpetrated by the leading community.
Of this nature was especially the infamous sentence of arbitration between the Aricini and the Rutuli in Ardea in 308, in which the Romans, called in to be arbiters regarding a border territory in dispute between the two communities, took it to themselves; and when this decision occasioned in Ardea internal dissensions in which the people wished to join the Volsci, while the nobility adhered to Rome, these dissensions were still more disgracefully employed as a pretext for the--already mentioned --sending of Roman colonists into the wealthy city, amongst whom the lands of the adherents of the party opposed to Rome were distributed (312).
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Reference address : https://www.ellopos.net/elpenor/rome/2-05-subjugation-latins-campanians.asp?pg=13