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
That bond but seldom succeeded in combining all the Etruscan cities even for the defence of the land, and the nominal hegemony of Volsinii does not admit of the most remote comparison with the energetic vigour which the leadership of Rome communicated to the Latin nation. The struggle against the exclusive claim put forward by the old burgesses to all public offices and to all public usufructs, which must have destroyed even the Roman state, had not its external successes enabled it in some measure to satisfy the demands of the oppressed proletariate at the expense of foreign nations and to open up other paths to ambition--that struggle against the exclusive rule and (what was specially prominent in Etruria) the priestly monopoly of the clan-nobility--must have ruined Etruria politically, economically, and morally.
Enormous wealth, particularly in landed property, became concentrated in the hands of a few nobles, while the masses were impoverished; the social revolutions which thence arose increased the distress which they sought to remedy; and, in consequence of the impotence of the central power, no course at last remained to the distressed aristocrats-- e. g. in Arretium in 453, and in Volsinii in 488--but to call in the aid of the Romans, who accordingly put an end to the disorder but at the same time extinguished the remnant of independence.
The energies of the nation were broken from the day of Veii and Melpum. Earnest attempts were still once or twice made to escape from the Roman supremacy, but in such instances the stimulus was communicated to the Etruscans from without--from another Italian stock, the Samnites.
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Reference address : https://www.ellopos.net/elpenor/rome/2-04-fall-etruscan-celts.asp?pg=33