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
Destruction of Fregallae
Fregellae, situated on the borders of Latium and Campania at the principal passage of the Liris in the midst of a large and fertile territory, at that time perhaps the second city of Italy and in the discussions with Rome the usual mouthpiece of all the Latin colonies, began war against Rome in consequence of the rejection of the proposal brought in by Flaccus--the first instance which had occurred for a hundred and fifty years of a serious insurrection, not brought about by foreign powers, in Italy against the Roman hegemony. But on this occasion the fire was successfully extinguished before it had caught hold of other allied communities.
Not through the superiority of the Roman arms, but through the treachery of a Fregellan Quintus Numitorius Pullus, the praetor Lucius Opimius quickly became master of the revolted city, which lost its civic privileges and its walls and was converted like Capua into a village. The colony of Fabrateria was founded on a part of its territory in 630; the remainder and the former city itself were distributed among the surrounding communities. This rapid and fearful punishment alarmed the allies, and endless impeachments for high treason pursued not only the Fregellans, but also the leaders of the popular party in Rome, who naturally were regarded by the aristocracy as accomplices in this insurrection.
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Reference address : https://www.ellopos.net/elpenor/rome/4-03-revolution-gaius-gracchus.asp?pg=12