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
Scipio Goes to Spain - Capture of New Carthage
Publius Scipio went to Spain in 544-5, accompanied by the propraetor Marcus Silanus, who was to succeed Nero and to serve as assistant and counsellor to the young commander-in-chief, and by his intimate friend Gaius Laelius as admiral, and furnished with a legion exceeding the usual strength and a well-filled chest. His appearance on the scene was at once signalized by one of the boldest and most fortunate -coups de main- that are known in history.
Of the three Carthaginian generals Hasdrubal Barcas was stationed at the sources, Hasdrubal son of Gisgo at the mouth, of the Tagus, and Mago at the Pillars of Hercules; the nearest of them was ten days' march from the Phoenician capital New Carthage. Suddenly in the spring of 545, before the enemy's armies began to move, Scipio set out with his whole army of nearly 30,000 men and the fleet for this town, which he could reach from the mouth of the Ebro by the coast route in a few days, and surprised the Phoenician garrison, not above 1000 men strong, by a combined attack by sea and land.
The town, situated on a tongue of land projecting into the harbour, found itself threatened at once on three sides by the Roman fleet, and on the fourth by the legions; and all help was far distant. Nevertheless the commandant Mago defended himself with resolution and armed the citizens, as the soldiers did not suffice to man the walls.
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Reference address : http://www.ellopos.net/elpenor/rome/3-06-war-hannibal-cannae-zama.asp?pg=40