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 Numantines, thus deprived of their last hope, sent to Scipio to negotiate as to their submission and called on the brave man to spare the brave; but when the envoys on their return announced that Scipio required unconditional surrender, they were torn in pieces by the furious multitude, and a fresh term elapsed before famine and pestilence had completed their work.
At length a second message was sent to the Roman headquarters, that the town was now ready to submit at discretion. When the citizens were accordingly instructed to appear on the following day before the gates, they asked for some days delay, to allow those of their number who had determined not to survive the loss of liberty time to die. It was granted, and not a few took advantage of it. At last the miserable remnant appeared before the gates.
Scipio chose fifty of the most eminent to form part of his triumphal procession; the rest were sold into slavery, the city was levelled with the ground, and its territory was distributed among the neighbouring towns. This occurred in the autumn of 621, fifteen months after Scipio had assumed the chief command.
The fall of Numantia struck at the root of the opposition that was still here and there stirring against Rome; military demonstrations and the imposition of fines sufficed to secure the acknowledgment of the Roman supremacy in all Hither Spain.
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Reference address : https://www.ellopos.net/elpenor/rome/4-01-gracchi.asp?pg=27