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 chivalrous character rendered it easy for him to enter into Spanish habits, and excited in the Spanish nobility the most ardent enthusiasm for the wonderful foreigner who had a spirit so kindred with their own. According to the warlike custom of personal following which subsisted in Spain as among the Celts and the Germans, thousands of the noblest Spaniards swore to stand faithfully by their Roman general unto death; and in them Sertorius found more trustworthy comrades than in his countrymen and party-associates. He did not disdain to turn to account the superstition of the ruder Spanish tribes, and to have his plans of war brought to him as commands of Diana by the white fawn of the goddess. Throughout he exercised a just and gentle rule.
His troops, at least so far as his eye and his arm reached, had to maintain the strictest discipline. Gentle as he generally was in punishing, he showed himself inexorable when any outrage was perpetrated by his soldiers on friendly soil. Nor was he inattentive to the permanent alleviation of the condition of the provincials; he reduced the tribute, and directed the soldiers to construct winter barracks for themselves, so that the oppressive burden of quartering the troops was done away and thus a source of unspeakable mischief and annoyance was stopped. For the children of Spaniards of quality an academy was erected at Osca (Huesca), in which they received the higher instruction usual in Rome, learning to speak Latin and Greek, and to wear the toga--a remarkable measure, which was by no means designed merely to take from the allies in as gentle a form as possible the hostages that in Spain were inevitable, but was above all an emanation from, and an advance onthe great project of Gaius Gracchus and the democratic party for gradually Romanizing the provinces.
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Reference address : https://www.ellopos.net/elpenor/rome/5-01-lepidus-sertorius.asp?pg=29