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 War on the Coasts of Sicily and Sardinia
Two plans were open to the Romans. They might attack Carthage on the Italian islands and deprive her of the coast fortresses of Sicily and Sardinia one after another--a scheme which was perhaps practicable through well-combined operations by land and sea; and, in the event of its being accomplished, peace might either be concluded with Carthage on the basis of the cession of these islands, or, should such terms not be accepted or prove unsatisfactory, the second stage of the war might be transferred to Africa.
Or they might neglect the islands and throw themselves at once with all their strength on Africa, not, in the adventurous style of Agathocles, burning their vessels behind them and staking all on the victory of a desperate band, but covering with a strong fleet the communications between the African invading army and Italy; and in that case a peace on moderate terms might be expected from the consternation of the enemy after the first successes, or, if the Romans chose, they might by pushing matters to an extremity compel the enemy to entire surrender.
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Reference address : https://www.ellopos.net/elpenor/rome/3-02-war-rome-carthage-sicily.asp?pg=26