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 near Beneventum-- Pyrrhus Leaves Italy-- Death of Pyrrhus
The king took the field in the spring of 479 with the view of aiding the hard-pressed Samnites, in whose territory the Romans had passed the previous winter; and he forced the consul Manius Curius to give battle near Beneventum on the -campus Arusinus-, before he could form a junction with his colleague advancing from Lucania.
But the division of the army, which was intended to take the Romans in flank, lost its way during its night march in the woods, and failed to appear at the decisive moment; and after a hot conflict the elephants again decided the battle, but decided it this time in favour of the Romans, for, thrown into confusion by the archers who were stationed to protect the camp, they attacked their own people. The victors occupied the camp; there fell into their hands 1300 prisoners and four elephants--the first that were seen in Rome--besides an immense spoil, from the proceeds of which the aqueduct, which conveyed the water of the Anio from Tibur to Rome, was subsequently built.
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Reference address : https://www.ellopos.net/elpenor/rome/2-07-pyrrhus-rome-italy.asp?pg=49