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 town was surprised by Metellus on the second day after its revolt, and given over to all the rigour of martial law; but if such was the temper of the easy to be reached and comparatively submissive dwellers on the banks of the Bagradas, what might be looked for farther inland and among the roving tribes of the desert? Jugurtha was the idol of the Africans, who readily overlooked the double fratricide in the liberator and avenger of their nation.
Twenty years afterwards a Numidian corps which was fighting in Italy for the Romans had to be sent back in all haste to Africa, when the son of Jugurtha appeared in the enemy's ranks; we may infer from this, how great was the influence which he himself exercised over his people. What prospect was there of a termination of the struggle in regions where the combined peculiarities of the population and of the soil allowed a leader, who had once secured the sympathies of the nation, to protract the war in endless guerilla conflicts, or even to let it sleep for a time in order to revive it at the right moment with renewed vigour?
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Reference address : https://www.ellopos.net/elpenor/rome/4-04-rule-restoration.asp?pg=48