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
Italians Friendly to Rome
The Etruscans and Umbrians on the other hand held by Rome, as they had already taken part with the equites against Drusus.(10)
10. Cf. IV. VI. Discussions on the Livian Laws
It is a significant fact, that in these regions the landed and moneyed aristocracy had from ancient times preponderated and the middle class had totally disappeared, whereas among and near the Abruzzi the farmer-class had preserved its purity and vigour better than anywhere else in Italy: it was from the farmers accordingly and the middle class in general that the revolt substantially proceeded, whereas the municipal aristocracy still went hand in hand with the government of the capital.
This also readily explains the fact, that there were in the insurgent districts isolated communities, and in the insurgent communities minorities, adhering to the Roman alliance; the Vestinian town Pinna, for instance, sustained a severe siege for Rome, and a corps of loyalists that was formed in the Hirpinian country under Minatius Magius of Aeclanum supported the Roman operations in Campania.
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Reference address : https://www.ellopos.net/elpenor/rome/4-07-sulpician-revolution.asp?pg=17