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
Their Political Development
On the other hand the Samnite people decidedly exhibited the highest political development among the eastern Italian stock, as the Latin nation did among the western. From an early period, perhaps from its first immigration, a comparatively strong political bond held together the Samnite nation, and gave to it the strength which subsequently enabled it to contend with Rome on equal terms for the first place in Italy.
We are as ignorant of the time and manner of the formation of the bond, as we are of its federal constitution; but it is clear that in Samnium no single community was preponderant, and still less was there any town to serve as a central rallying point and bond of union for the Samnite stock, such as Rome was for the Latins. The strength of the land lay in its -communes- of husbandmen, and authority was vested in the assembly formed of their representatives; it was this assembly which in case of need nominated a federal commander-in-chief. In consequence of its constitution the policy of this confederacy was not aggressive like the Roman, but was limited to the defence of its own bounds; only where the state forms a unity is power so concentrated and passion so strong, that the extension of territory can be systematically pursued.
Accordingly the whole history of the two nations is prefigured in their diametrically opposite systems of colonization. Whatever the Romans gained, was a gain to the state: the conquests of the Samnites were achieved by bands of volunteers who went forth in search of plunder and, whether they prospered or were unfortunate, were left to their own resources by their native home. The conquests, however, which the Samnites made on the coasts of the Tyrrhenian and Ionic seas, belong to a later age; during the regal period in Rome they seem to have been only gaining possession of the settlements in which we afterwards find them.
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Reference address : https://www.ellopos.net/elpenor/rome/1-08-umbro-sabellian-samnites.asp?pg=7