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
All the north of Italy, Etruscans, Umbrians, Gauls, were thus in arms against Rome; great results might be achieved, if its southern provinces also should seize the moment and declare, so far as they had not already done so, against Rome. In fact the Samnites, ever ready to make a stand on behalf of liberty, appear to have declared war against the Romans; but weakened and hemmed in on all sides as they were, they could be of little service to the league; and Tarentum manifested its wonted delay.
While her antagonists were negotiating alliances, settling treaties as to subsidies, and collecting mercenaries, Rome was acting. The Senones were first made to feel how dangerous it was to gain a victory over the Romans. The consul Publius Cornelius Dolabella advanced with a strong army into their territory; all that were not put to the sword were driven forth from the land, and this tribe was erased from the list of the Italian nations (471).
In the case of a people subsisting chiefly on its flocks and herds such an expulsion en masse was quite practicable; and the Senones thus expelled from Italy probably helped to make up the Gallic hosts which soon after inundated the countries of the Danube, Macedonia, Greece, and Asia Minor.
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Reference address : https://www.ellopos.net/elpenor/rome/2-07-pyrrhus-rome-italy.asp?pg=13