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 generals had encountered an opponent far superior in talent, a tough and protracted resistance, a warfare of very serious perils and of successes difficult to be attained and far from brilliant; it was asserted that Pompeius was scheming to get himself recalled from Spain and entrusted with a more desirable command somewhere else. The soldiers, too, found little satisfaction in a campaign in which not only was there nothing to be got save hard blows and worthless booty, but their very pay was doled out to them with extreme irregularity. Pompeius reported to the senate, at the end of 679, that the pay was two years in arrear, and that the army was threatening to break up.
The Roman government might certainly have obviated a considerable portion of these evils, if they could have prevailed on themselves to carry on the Spanish war with less remissness, to say nothing of better will. In the main, however, it was neither their fault nor the fault of their generals that a genius so superior as that of Sertorius was able to carry on this petty warfare year after year, despite of all numerical and military superiority, on ground so thoroughly favourable to insurrectionary and piratical warfare. So little could its end be foreseen, that the Sertorian insurrection seemed rather as if it would become intermingled with other contemporary revolts and thereby add to its dangerous character.
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Reference address : https://www.ellopos.net/elpenor/rome/5-01-lepidus-sertorius.asp?pg=49