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 found matters in that position. He had hardly arrived when he despatched the troops which he had brought with him and the militia of Utica by sea to the threatened point, and succeeded in saving its garrison and holding the cliff itself. After this danger was averted, the general proceeded to the camp of Piso to take over the army and bring it back to Carthage. Hasdrubal and Bithyas availed themselves of his absence to move their camp immediately up to the city, and to renew the attack on the garrison of the cliff before Magalia; but even now Scipio appeared with the vanguard of the main army in sufficient time to afford assistance to the post. Then the siege began afresh and more earnestly.
First of all Scipio cleared the camp of the mass of camp-followers and sutlers and once more tightened the relaxed reins of discipline. Military operations were soon resumed with increased vigour. In an attack by night on the suburb the Romans succeeded in passing from a tower--placed in front of the walls and equal to them in height--on to the battlements, and opened a little gate through which the whole army entered. The Carthaginians abandoned the suburb and their camp before the gates, and gave the chief command of the garrison of the city, amounting to 30,000 men, to Hasdrubal.
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Reference address : https://www.ellopos.net/elpenor/rome/4-01-gracchi.asp?pg=58