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
His declining the suggestion would probably lead to a breach; his accepting it would throw his most aristocratic and bravest officer into the hands of a man more than untrustworthy, who, as every one knew, played a double game with the Romans and with Jugurtha, and who seemed almost to have contrived the scheme for the purpose of obtaining for himself provisional hostages from both sides in the persons of Jugurtha and Sulla.
But the wish to terminate the war outweighed every other consideration, and Sulla agreed to undertake the perilous task which Marius suggested to him. He boldly departed under the guidance of Volux the son of king Bocchus, nor did his resolution waver even when his guide led him through the midst of Jugurtha's camp. He rejected the pusillanimous proposals of flight that came from his attendants, and marched, with the king's son at his side, uninjured through the enemy. The daring officer evinced the same decision in the discussions with the sultan, and induced him at length seriously to make his choice.
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Reference address : https://www.ellopos.net/elpenor/rome/4-04-rule-restoration.asp?pg=57