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
Attempts at Peace
The barbarians, however, acted with a moderation which, considering their power and the provocation they had received, excites astonishment. It was the interest of Rome to maintain as long as possible the Tarentine neutrality, and the leading men in the senate accordingly rejected the proposal, which a minority had with natural resentment submitted, to declare war at once against the Tarentines. In fact, the continuance of peace on the part of Rome was proffered on the most moderate terms consistent with her honour--the release of the captives, the restoration of Thurii, the surrender of the originators of the attack on the fleet.
A Roman embassy proceeded with these proposals to Tarentum (473), while at the same time, to add weight to their words, a Roman army under the consul Lucius Aemilius advanced into Samnium. The Tarentines could, without forfeiting aught of their independence, accept these terms; and considering the little inclination for war in so wealthy a commercial city, the Romans had reason to presume that an accommodation was still possible.
But the attempt to preserve peace failed, whether through the opposition of those Tarentines who recognized the necessity of meeting the aggressions of Rome, the sooner the better, by a resort to arms, or merely through the unruliness of the city rabble, which with characteristic Greek naughtiness subjected the person of the envoy to an unworthy insult.
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Reference address : https://www.ellopos.net/elpenor/rome/2-07-pyrrhus-rome-italy.asp?pg=18