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
The Rupture - Fregellan War - Difficulty of a General Insurrection
It belongs to the nature of such differences that, restrained by the sense of national unity and by the remembrance of dangers surmounted in common, they make their appearance at first gently and as it were modestly, till the breach gradually widens and the relation between the rulers, whose might is their sole right, and the ruled, whose obedience reaches no farther than their fears, manifests at length undisguisedly the character of force.
Down to the revolt and razing of Fregellae in 629, which as it were officially attested the altered character of the Roman rule, the ferment among the Italians did not properly wear a revolutionary character. The longing after equal rights had gradually risen from a silent wish to a loud request, only to be the more decidedly rejected, the more distinctly it was put forward. It was very soon apparent that a voluntary concession was not to be hoped for, and the wish to extort what was refused would not be wanting; but the position of Rome at that time hardly permitted them to entertain any idea of realizing that wish.
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Reference address : https://www.ellopos.net/elpenor/rome/4-07-sulpician-revolution.asp?pg=7