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
Outbreak of the Insurrection in Asculum
Marsians and Sabellians - Central and Southern Italy
The Roman praetor with proconsular powers, Gaius Servilius, informed by his spies that the town of Asculum (Ascoli) in the Abruzzi was sending hostages to the neighbouring communities, proceeded thither with his legate Fonteius and a small escort, and addressed to the multitude, which was just then assembled in the theatre for the celebration of the great games, a vehement and menacing harangue.
The sight of the axes known only too well, the proclamation of threats that were only too seriously meant, threw the spark into the fuel of bitter hatred that had been accumulating for centuries; the Roman magistrates were torn to pieces by the multitude in the theatre itself, and immediately, as if it were their intention by a fearful outrage to break down every bridge of reconciliation, the gates were closed by command of the magistracy, all the Romans residing in Asculum were put to death, and their property was plundered. The revolt ran through the peninsula like the flame through the steppe.
The brave and numerous people of the Marsians took the lead, in connection with the small but hardy confederacies in the Abruzzi--the Paeligni, Marrucini, Frentani, and Vestini. The brave and sagacious Quintus Silo, already mentioned, was here the soul of the movement. The Marsians were the first formally to declare against the Romans, whence the war retained afterwards the name of the Marsian war. The example thus given was followed by the Samnite communities, and generally by the mass of the communities from the Liris and the Abruzzi down to Calabria and Apulia; so that all Central and Southern Italy was soon in arms against Rome.
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Reference address : https://www.ellopos.net/elpenor/rome/4-07-sulpician-revolution.asp?pg=16