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 Ausculum
In the spring of 475 Pyrrhus resumed the offensive, and advanced into Apulia, whither the Roman army marched to meet him. In the hope of shaking the Roman symmachy in these regions by a decisive victory, the king offered battle a second time, and the Romans did not refuse it. The two armies encountered each other near Ausculum (Ascoli di Puglia).
Under the banners of Pyrrhus there fought, besides his Epirot and Macedonian troops, the Italian mercenaries, the burgess-force--the white shields as they were called--of Tarentum, and the allied Lucanians, Bruttians, and Samnites--altogether 70,000 infantry, of whom 16,000 were Greeks and Epirots, more than 8000 cavalry, and nineteen elephants. The Romans were supported on that day by the Latins, Campanians, Volscians, Sabines, Umbrians, Marrucinians, Paelignians, Frentanians, and Arpanians. They too numbered above 70,000 infantry, of whom 20,000 were Roman citizens, and 8000 cavalry.
Both parties had made alterations in their military system. Pyrrhus, perceiving with the sharp eye of a soldier the advantages of the Roman manipular organization, had on the wings substituted for the long front of his phalanxes an arrangement by companies with intervals between them in imitation of the cohorts, and-- perhaps for political no less than for military reasons--had placed the Tarentine and Samnite cohorts between the subdivisions of his own men.
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Reference address : https://www.ellopos.net/elpenor/rome/2-07-pyrrhus-rome-italy.asp?pg=33