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
During the first summer the general avoided any conflict with the Numantines; he contented himself with destroying the stores in the surrounding country, and with chastising the Vaccaei who sold corn to the Numantines, and compelling them to acknowledge the supremacy of Rome. It was only towards winter that Scipio drew together his army round Numantia. Besides the Numidian contingent of horsemen, infantry, and twelve elephants led by the prince Jugurtha, and the numerous Spanish contingents, there were four legions, in all a force of 60,000 men investing a city whose citizens capable of bearing arms did not exceed 8000 at the most.
Nevertheless the besieged frequently offered battle; but Scipio, perceiving clearly that the disorganization of many years was not to be repaired all at once, refused to accept it, and, when conflicts did occur in connection with the sallies of the besieged, the cowardly flight of the legionaries, checked with difficulty by the appearance of the general in person, justified such tactics only too forcibly. Never did a general treat his soldiers more contemptuously than Scipio treated the Numantine army; and he showed his opinion of it not only by bitter speeches, but above all by his course of action.
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Reference address : https://www.ellopos.net/elpenor/rome/4-01-gracchi.asp?pg=25