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
The allies would willingly have brought Rhegium also on the opposite coast under their power; but Rome could not possibly pardon the Campanian garrison, and an attempt of the combined Romans and Carthaginians to gain the city by force of arms miscarried. The Carthaginian fleet sailed thence for Syracuse and blockaded the city by sea, while at the same time a strong Phoenician army began the siege by land (476). It was high time that Pyrrhus should appear at Syracuse: but, in fact, matters in Italy were by no means in such a condition that he and his troops could be dispensed with there.
The two consuls of 476, Gaius Fabricius Luscinus, and Quintus Aemilius Papus, both experienced generals, had begun the new campaign with vigour, and although the Romans had hitherto sustained nothing but defeat in this war, it was not they but the victors that were weary of it and longed for peace. Pyrrhus made another attempt to obtain accommodation on tolerable terms. The consul Fabricius had handed over to the king a wretch, who had proposed to poison him on condition of being well paid for it.
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Reference address : https://www.ellopos.net/elpenor/rome/2-07-pyrrhus-rome-italy.asp?pg=39