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
Construction of New Fortresses and Roads
For the securing of these immense acquisitions a new series of colonies was instituted: Paestum and Cosa in Lucania (481); Beneventum (486), and Aesernia (about 491) to hold Samnium in check; and, as outposts against the Gauls, Ariminum (486), Firmum in Picenum (about 490), and the burgess colony of Castrum Novum. Preparations were made for the continuation of the great southern highway--which acquired in the fortress of Beneventum a new station intermediate between Capua and Venusia--as far as the seaports of Tarentum and Brundisium, and for the colonization of the latter seaport, which Roman policy had selected as the rival and successor of the Tarentine emporium.
The construction of the new fortresses and roads gave rise to some further wars with the small tribes, whose territory was thereby curtailed: with the Picentes (485, 486), a number of whom were transplanted to the district of Salernum; with the Sallentines about Brundisium (487, 488); and with the Umbrian Sassinates (487, 488), who seem to have occupied the territory of Ariminum after the expulsion of the Senones. By these establishments the dominion of Rome was extended over the interior of Lower Italy, and over the whole Italian east coast from the Ionian sea to the Celtic frontier.
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Reference address : https://www.ellopos.net/elpenor/rome/2-07-pyrrhus-rome-italy.asp?pg=53