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
They had at their disposal more than half a million of serviceable soldiers; the Roman cavalry alone was less good, and relatively less numerous, than the Carthaginian, the former constituting about a tenth, the latter an eighth, of the whole number of troops taking the field. None of the states affected by the war had any fleet corresponding to the Roman fleet of 220 quinqueremes, which had just returned from the Adriatic to the western sea.
The natural and proper application of this crushing superiority of force was self-evident. It had been long settled that the war ought to be opened with a landing in Africa. The subsequent turn taken by events had compelled the Romans to embrace in their scheme of the war a simultaneous landing in Spain, chiefly to prevent the Spanish army from appearing before the walls of Carthage.
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Reference address : https://www.ellopos.net/elpenor/rome/3-04-hamilcar-hannibal.asp?pg=36