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
Moreover, the present moment presented comparatively favourable prospects for a general insurrection throughout Italy. We are not exactly informed how far the Romans had carried out the dissolution of the larger Italian confederacies;(9) but it is not improbable that the Marsians, the Paelignians, and perhaps even the Samnites and Lucanians still were associated in their old communal leagues, though these had lost their political significance and were in some cases probably reduced to mere fellowship of festivals and sacrifices.
9. Cf. II. VII. Dissolution of National Leagues
The insurrection, if it should now begin, would still find a rallying point in these unions; but who could say how soon the Romans would for that very reason proceed to abolish these also? The secret league, moreover, which was alleged to be headed by Drusus, had lost in him its actual or expected chief, but it continued to exist and afforded an important nucleus for the political organization of the insurrection; while its military organization might be based on the fact that each allied town possessed its own armament and experienced soldiers.
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Reference address : https://www.ellopos.net/elpenor/rome/4-07-sulpician-revolution.asp?pg=14