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
Method of Attack
But how could Italy be attacked? He might succeed in reaching the peninsula by sea or by land; but if the project was to be no mere desperate adventure, but a military expedition with a strategic aim, a nearer basis for its operations was requisite than Spain or Africa. Hannibal could not rely for support on a fleet and a fortified harbour, for Rome was now mistress of the sea. As little did the territory of the Italian confederacy present any tenable basis.
If in very different times, and in spite of Greek sympathies, it had withstood the shock of Pyrrhus, it was not to be expected that it would now fall to pieces on the appearance of the Phoenician general; an invading army would without doubt be crushed between the network of Roman fortresses and the firmly-consolidated confederacy. The land of the Ligurians and Celts alone could be to Hannibal, what Poland was to Napoleon in his very similar Russian campaigns.
These tribes still smarting under their scarcely ended struggle for independence, alien in race from the Italians, and feeling their very existence endangered by the chain of Roman fortresses and highways whose first coils were even now being fastened around them, could not but recognize their deliverers in the Phoenician army (which numbered in its ranks numerous Spanish Celts), and would serve as a first support for it to fall back upon--a source whence it might draw supplies and recruits.
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Reference address : https://www.ellopos.net/elpenor/rome/3-04-hamilcar-hannibal.asp?pg=31