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
Farther Retreat to Pontus
So the spring of 687 came on. The reunion of the army in Nisibis, the idleness of winter-quarters, the frequent absence of the general, had meanwhile increased the insubordination of the troops; not only did they vehemently demand to be led back, but it was already tolerably evident that, if the general refused to lead them home, they would break up of themselves. The supplies were scanty; Fannius and Triarius, in their distress, sent the most urgent entreaties to the general to furnish aid. With a heavy heart Lucullus resolved to yield to necessity, to give up Nisibis and Tigranocerta, and, renouncing all the brilliant hopes of his Armenian expedition, to return to the right bank of the Euphrates.
Fannius was relieved; but in Pontus the help was too late. Triarius, not strong enough to fight with Mithradates, had taken up a strong position at Gaziura (Turksal on the Iris, to the west of Tokat), while the baggage was left behind at Dadasa. But when Mithradates laid siege to the latter place, the Roman soldiers, apprehensive for their property, compelled their leader to leave his secure position, and to give battle to the king between Gaziura and Ziela (Zilleh) on the Scotian heights.
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Reference address : https://www.ellopos.net/elpenor/rome/5-02-rule-sullan-restoration.asp?pg=58