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
Another remarkable instance of the Roman practice of turning to account for their own interest the variances between the orders in the dependent communities by favouring the aristocracy, is furnished by the treatment which Volsinii met with in 489. There, just as in Rome, the old and new burgesses must have stood opposed to one another, and the latter must have attained by legal means equality of political rights.
In consequence of this the old burgesses of Volsinii resorted to the Roman senate with a request for the restoration of their old constitution--a step which the ruling party in the city naturally viewed as high treason, and inflicted legal punishment accordingly on the petitioners. The Roman senate, however, took part with the old burgesses, and, when the city showed no disposition to submit, not only destroyed by military violence the communal constitution of Volsinii which was In recognized operation, but also, by razing the old capital of Etruria, exhibited to the Italians a fearfully palpable proof of the mastery of Rome.
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Reference address : https://www.ellopos.net/elpenor/rome/2-07-pyrrhus-rome-italy.asp?pg=81