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
Mithradates advanced into Pontus with 4000 Armenian horsemen and 4000 of his own, and as liberator and avenger summoned the nation to rise against the common foe. All joined him; the scattered Roman soldiers were everywhere seized and put to death: when Hadrianus, the Roman commandant in Pontus,(19) led his troops against him, the former mercenaries of the king and the numerous natives of Pontus following the army as slaves made common cause with the enemy.
19. Cf. V. II. Invasion of Pontus by Lucullus
For two successive days the unequal conflict lasted; it was only the circumstance that the king after receiving two wounds had to be carried off from the field of battle, which gave the Roman commander the opportunity of breaking off the virtually lost battle, and throwing himself with the small remnant of his troops into Cabira. Another of Lucullus' lieutenants who accidentally came into this region, the resolute Triarius, again gathered round him a body of troops and fought a successful engagement with the king; but he was much too weak to expel him afresh from Pontic soil, and had to acquiesce while the king took up winter-quarters in Comana.
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Reference address : https://www.ellopos.net/elpenor/rome/5-02-rule-sullan-restoration.asp?pg=57