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
But Claudius did not allow himself to be deterred, and on a second attempt he succeeded in landing. Scarcely had he arrived when he called a meeting of the citizens; and, at his wish, the Carthaginian admiral also appeared at the meeting, still imagining that he should be able to avoid an open breach. But the Romans seized his person in the assembly itself; and Hanno and the Phoenician garrison in the citadel, weak and destitute of a leader, were pusillanimous enough, the former to give to his troops the command to withdraw, the latter to comply with the orders of their captive general and to evacuate the city along with him. Thus the tete de pont of the island fell into the hands of the Romans.
The Carthaginian authorities, justly indignant at the folly and weakness of their general, caused him to be executed, and declared war against the Romans. Above all it was their aim to recover the lost place. A strong Carthaginian fleet, led by Hanno, son of Hannibal, appeared off Messana; while the fleet blockaded the straits, the Carthaginian army landing from it began the siege on the north side. Hiero, who had only waited for the Carthaginian attack to begin the war with Rome, again brought up his army, which he had hardly withdrawn, against Messana, and undertook the attack on the south side of the city.
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Reference address : https://www.ellopos.net/elpenor/rome/3-02-war-rome-carthage-sicily.asp?pg=14