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
Pyrrhus and the Coalition
The affairs of the coalition were in no very favourable state when the king arrived. The Roman consul indeed, as soon as he saw the soldiers of Milo taking the field against him instead of the Tarentine militia, had abandoned the attack on Tarentum and retreated to Apulia; but, with the exception of the territory of Tarentum, the Romans virtually ruled all Italy. The coalition had no army in the field anywhere in Lower Italy; and in Upper Italy the Etruscans, who alone were still in arms, had in the last campaign (473) met with nothing but defeat.
The allies had, before the king embarked, committed to him the chief command of all their troops, and declared that they were able to place in the field an army of 350,000 infantry and 20,000 cavalry. The reality formed a sad contrast to these great promises. The army, whose chief command had been committed to Pyrrhus, had still to be created; and for the time being the main resources available for forming it were those of Tarentum alone.
The king gave orders for the enlisting of an army of Italian mercenaries with Tarentine money, and called out the able-bodied citizens to serve in the war. But the Tarentines had not so understood the agreement. They had thought to purchase victory, like any other commodity, with money; it was a sort of breach of contract, that the king should compel them to fight for it themselves.
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Reference address : https://www.ellopos.net/elpenor/rome/2-07-pyrrhus-rome-italy.asp?pg=22