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 Scipios Defeated and Killed - Spain South of the Ebro Lost to the Romans - Nero Sent to Spain
This turn of affairs in Africa had an important effect on the war in Spain. Hasdrubal was able once more to turn to that country (543), whither he was soon followed by considerable reinforcements and by Massinissa himself. The Scipios, who during the absence of the enemy's general (541, 542) had continued to plunder and to gain partisans in the Carthaginian territory, found themselves unexpectedly assailed by forces so superior that they were under the necessity of either retreating behind the Ebro or calling out the Spaniards.
They chose the latter course, and took into their pay 20,000 Celtiberians; and then, in order the better to encounter the three armies of the enemy under Hasdrubal Barcas, Hasdrubal the son of Gisgo, and Mago, they divided their army and did not even keep their Roman troops together. They thus prepared the way for their own destruction. While Gnaeus with his corps, containing a third of the Roman and all the Spanish troops, lay encamped opposite to Hasdrubal Barcas, the latter had no difficulty in inducing the Spaniards in the Roman army by means of a sum of money to withdraw--which perhaps to their free- lance ideas of morals did not even seem a breach of fidelity, seeing that they did not pass over to the enemies of their paymaster.
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Reference address : https://www.ellopos.net/elpenor/rome/3-06-war-hannibal-cannae-zama.asp?pg=33