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
Battle of Sentinum-- Peace with Etruria
Nevertheless it was a hotly contested day. On the right wing of the Romans, where Rullianus with his two legions fought against the Samnite army, the conflict remained long undecided. On the left, which Publius Decius commanded, the Roman cavalry was thrown into confusion by the Gallic war chariots, and the legions also already began to give way. Then the consul called to him Marcus Livius the priest, and bade him devote to the infernal gods both the head of the Roman general and the army of the enemy; and plunging into the thickest throng of the Gauls he sought death and found it.
This heroic deed of despair on the part of one so eminent as a man and so beloved as a general was not in vain. The fugitive soldiers rallied; the bravest threw themselves after their leader into the hostile ranks, to avenge him or to die with him; and just at the right moment the consular Lucius Scipio, despatched by Rullianus, appeared with the Roman reserve on the imperilled left wing. The excellent Campanian cavalry, which fell on the flank and rear of the Gauls, turned the scale; the Gauls fled, and at length the Samnites also gave way, their general Egnatius falling at the gate of the camp. Nine thousand Romans strewed the field of battle; but dearly as the victory was purchased, it was worthy of such a sacrifice.
The army of the coalition was dissolved, and with it the coalition itself; Umbria remained in the power of the Romans, the Gauls dispersed, the remnant of the Samnites still in compact order retreated homeward through the Abruzzi. Campania, which the Samnites had overrun during the Etruscan war, was after its close re-occupied with little difficulty by the Romans. Etruria sued for peace in the following year (460); Volsinii, Perusia, Arretium, and in general all the towns that had joined the league against Rome, promised a cessation of hostilities for four hundred months.
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Reference address : https://www.ellopos.net/elpenor/rome/2-06-italians-rome.asp?pg=35