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
Politically it mattered little in the first instance at what sacrifices the victory was bought; the gain of the first battle against the Romans was of inestimable value for Pyrrhus. His talents as a general had been brilliantly displayed on this new field of battle, and if anything could breathe unity and energy into the languishing league of the Italians, the victory of Heraclea could not fail to do so. But even the immediate results of the victory were considerable and lasting.
Lucania was lost to the Romans: Laevinus collected the troops stationed there and marched to Apulia, The Bruttians, Lucanians, and Samnites joined Pyrrhus unmolested. With the exception of Rhegium, which pined under the oppression of the Campanian mutineers, the whole of the Greek cities joined the king, and Locri even voluntarily delivered up to him the Roman garrison; in his case they were persuaded, and with reason, that they would not be abandoned to the Italians. The Sabellians and Greeks thus passed over to Pyrrhus; but the victory produced no further effect.
The Latins showed no inclination to get quit of the Roman rule, burdensome as it might be, by the help of a foreign dynast. Venusia, although now wholly surrounded by enemies, adhered with unshaken steadfastness to Rome. Pyrrhus proposed to the prisoners taken on the Siris, whose brave demeanour the chivalrous king requited by the most honourable treatment, that they should enter his army in accordance with the Greek fashion; but he learned that he was fighting not with mercenaries, but with a nation. Not one, either Roman or Latin, took service with him.
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Reference address : https://www.ellopos.net/elpenor/rome/2-07-pyrrhus-rome-italy.asp?pg=28