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
Peace with Samnium
The fall of the chief stronghold of the land terminated the twenty-two years' war. The Samnites withdrew their garrisons from Sora and Arpinum, and sent envoys to Rome to sue for peace; the Sabellian tribes, the Marsi, Marrucini, Paeligni, Frentani, Vestini, and Picentes followed their example. The terms granted by Rome were tolerable; cessions of territory were required from some of them, from the Paeligni for instance, but they do not seem to have been of much importance. The equal alliance was renewed between the Sabellian tribes and the Romans (450).
And with Tarentum
Presumably about the same time, and in consequence doubtless of the Samnite peace, peace was also made between Rome and Tarentum. The two cities had not indeed directly opposed each other in the field. The Tarentines had been inactive spectators of the long contest between Rome and Samnium from its beginning to its close, and had only kept up hostilities in league with the Sallentines against the Lucanians who were allies of Rome. In the last years of the Samnite war no doubt they had shown some signs of more energetic action.
The position of embarrassment to which the ceaseless attacks of the Lucanians reduced them on the one hand, and on the other hand the feeling ever obtruding itself on them more urgently that the complete subjugation of Samnium would endanger their own independence, induced them, notwithstanding their unpleasant experiences with Alexander, once more to entrust themselves to a -condottiere-.
There came at their call the Spartan prince Cleonymus, accompanied by five thousand mercenaries; with whom he united a band equally numerous raised in Italy, as well as the contingents of the Messapians and of the smaller Greek towns, and above all the Tarentine civic army of twenty-two thousand men. At the head of this considerable force he compelled the Lucanians to make peace with Tarentum and to install a government of Samnite tendencies; in return for which Metapontum was abandoned to them.
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Reference address : https://www.ellopos.net/elpenor/rome/2-06-italians-rome.asp?pg=26