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
Just resentment urged the Carthaginians to accept that offer of war; had Catulus insisted upon the cession of Sardinia five years before, the war would probably have pursued its course. But now, when both islands were lost, when Libya was in a ferment, and when the state was weakened to the utmost by its twenty-four years' struggle with Rome and the dreadful civil war that had raged for nearly five years more, they were obliged to submit It was only after repeated entreaties, and after the Phoenicians had bound themselves to pay to Rome a compensation of 1200 talents (292,000 pounds) for the warlike preparations which had been wantonly occasioned, that the Romans reluctantly desisted from war.
Thus the Romans acquired Sardinia almost without a struggle; to which they added Corsica, the ancient possession of the Etruscans, where perhaps some detached Roman garrisons still remained over from the last war.(3)
3. Cf. III. II. The War on the Coasts of Sicily and Sardinia
In Sardinia, however, and still more in the rugged Corsica, the Romans restricted themselves, just as the Phoenicians had done, to an occupation of the coasts. With the natives in the interior they were continually engaged in war or, to speak more correctly, in hunting them like wild beasts; they baited them with dogs, and carried what they captured to the slave market; but they undertook no real conquest. They had occupied the islands not on their own account, but for the security of Italy. Now that the confederacy possessed the three large islands, it might call the Tyrrhene Sea its own.
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Reference address : https://www.ellopos.net/elpenor/rome/3-03-extension-italy.asp?pg=8