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
Arrived on the Italian coast, the king began by an attempt to get possession of Rhegium; but the Campanians repulsed the attack with the aid of the Mamertines, and in the heat of the conflict before the town the king himself was wounded in the act of striking down an officer of the enemy.
On the other hand he surprised Locri, whose inhabitants suffered severely for their slaughter of the Epirot garrison, and he plundered the rich treasury of the temple of Persephone there, to replenish his empty exchequer. Thus he arrived at Tarentum, it is said with 20,000 infantry and 3000 cavalry.
But these were no longer the experienced veterans of former days, and the Italians no longer hailed them as deliverers; the confidence and hope with which they had received the king five years before were gone; the allies were destitute of money and of men.
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Reference address : https://www.ellopos.net/elpenor/rome/2-07-pyrrhus-rome-italy.asp?pg=48