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
Peace with Hiero
But meanwhile the Roman consul Appius Claudius Caudex had appeared at Rhegium with the main body of his army, and succeeded in crossing on a dark night in spite of the Carthaginian fleet. Audacity and fortune were on the side of the Romans; the allies, not prepared for an attack by the whole Roman army and consequently not united, were beaten in detail by the Roman legions issuing from the city; and thus the siege was raised. The Roman army kept the field during the summer, and even made an attempt on Syracuse; but, when that had failed and the siege of Echetla (on the confines of the territories of Syracuse and Carthage) had to be abandoned with loss, the Roman army returned to Messana, and thence, leaving a strong garrison behind them, to Italy.
The results obtained in this first campaign of the Romans out of Italy may not quite have corresponded to the expectations at home, for the consul had no triumph; nevertheless, the energy which the Romans displayed in Sicily could not fail to make a great impression on the Sicilian Greeks. In the following year both consuls and an army twice as large entered the island unopposed. One of them, Marcus Valerius Maximus, afterwards called from this campaign the "hero of Messana" (-Messalla-), achieved a brilliant victory over the allied Carthaginians and Syracusans.
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Reference address : https://www.ellopos.net/elpenor/rome/3-02-war-rome-carthage-sicily.asp?pg=15