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 senate, which formed a correct judgment as to the importance and the peculiar character of the Spanish war, and had learned from the Uticenses brought in as prisoners by the Roman fleet the great exertions which were making in Carthage to send Hasdrubal and Massinissa with a numerous army over the Pyrenees, resolved to despatch to Spain new reinforcements and an extraordinary general of higher rank, the nomination of whom they deemed it expedient to leave to the people.
For long--so runs the story--nobody announced himself as ready to take in hand the complicated and perilous business; but at last a young officer of twenty-seven, Publius Scipio (son of the general of the same name that had fallen in Spain), who had held the offices of military tribune and aedile, came forward to solicit it. It is incredible that the Roman senate should have left to accident an election of such importance in this meeting of the Comitia which it had itself suggested, and equally incredible that ambition and patriotism should have so died out in Rome that no tried officer presented himself for the important post.
If on the other hand the eyes of the senate turned to the young, talented, and experienced officer, who had brilliantly distinguished himself in the hotly- contested days on the Ticinus and at Cannae, but who still had not the rank requisite for his coming forward as the successor of men who had been praetors and consuls, it was very natural to adopt this course, which compelled the people out of good nature to admit the only candidate notwithstanding his defective qualification, and which could not but bring both him and the Spanish expedition, which was doubtless very unpopular, into favour with the multitude.
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Reference address : https://www.ellopos.net/elpenor/rome/3-06-war-hannibal-cannae-zama.asp?pg=37