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
Flaccus was deposed by the army and soon afterwards put to death at Nicomedia, not far from Chalcedon; Fimbria was installed by decree of the soldiers in his stead. As a matter of course he allowed his troops every indulgence; in the friendly Cyzicus, for instance, the citizens were ordered to surrender all their property to the soldiers on pain of death, and by way of warning example two of the most respectable citizens were at once executed. Nevertheless in a military point of view the change of commander-in-chief was a gain; Fimbria was not, like Flaccus, an incapable general, but energetic and talented.
At Miletopolis (on the Rhyndacus to the west of Brussa) he defeated the younger Mithradates, who as governor of the satrapy of Pontus had marched against him, completely in a nocturnal assault, and by this victory opened his way to Pergamus, the capital formerly of the Roman province and now of the Pontic king, whence he dislodged the king and compelled him to take flight to the port of Pitane not far off, with the view of there embarking. Just at that moment Lucullus appeared in those waters with his fleet; Fimbria adjured him to render assistance so that he might be enabled to capture the king.
But the Optimate was stronger in Lucullus than the patriot; he sailed onward and the king escaped to Mitylene. The situation of Mithradates was even thus sufficiently embarrassed. At the end of 669 Europe was lost, Asia Minor was partly in rebellion against him, partly occupied by a Roman army; and he was himself threatened by the latter in his immediate vicinity. The Roman fleet under Lucullus had maintained its position on the Trojan coast by two successful naval engagements at the promontory of Lectum and at the island of Tenedos; it was joined there by the ships which had in the meanwhile been built by Sulla's orders in Thessaly, and by it position commanding the Hellespont it secured to the general of the Roman senatorial army a safe and easy passage next spring to Asia.
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Reference address : https://www.ellopos.net/elpenor/rome/4-08-east-king-mithradates.asp?pg=63