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
Conflicts without Result
Accordingly he took the place of Metellus in the course of 647; and held the command in the campaign of the following year; but his confident promise to do better than his predecessor and to deliver Jugurtha bound hand and foot with all speed at Rome was more easily given than fulfilled.
Marius carried on a desultory warfare with the Gaetulians; he reduced several towns that had not previously been occupied; he undertook an expedition to Capsa (Gafsa) in the extreme south-east of the kingdom, which surpassed even that of Thala in difficulty, took the town by capitulation, and in spite of the convention caused all the adult men in it to be slain--the only means, no doubt, of preventing the renewed revolt of that remote city of the desert; he attacked a mountain-stronghold--situated on the river Molochath, which separated the Numidian territory from the Mauretanian--whither Jugurtha had conveyed his treasure-chest, and, just as he was about to desist from the siege in despair of success, fortunately gained possession of the impregnable fastness through the coup de main of some daring climbers.
Had his object merely been to harden the army by bold razzias and to procure booty for the soldiers, or even to eclipse the march of Metellus into the desert by an expedition going still farther, this method of warfare might be allowed to pass unchallenged; but the main object to be aimed at, and which Metellus had steadfastly and perseveringly kept in view-- the capture of Jugurtha--was in this way utterly set aside.
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Reference address : https://www.ellopos.net/elpenor/rome/4-04-rule-restoration.asp?pg=53