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 contented himself with complaining to Murena and, when this was in vain, to the Roman government. In fact commissioners from Sulla made their appearance to dissuade the governor, but he did not submit; on the contrary he crossed the Halys and entered on the undisputed territory of Pontus, whereupon Mithradates resolved to repel force by force.
His general Gordius had to detain the Roman army till the king came up with far superior forces and compelled battle; Murena was vanquished and with great loss driven back over the Roman frontier to Phrygia, and the Roman garrisons were expelled from all Cappadocia. Murena had the effrontery, no doubt, to call himself the victor and to assume the title of -imperator- on account of these events (672); but the sharp lesson and a second admonition from Sulla induced him at last to push the matter no farther; the peace between Rome and Mithradates was renewed (673).
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Reference address : https://www.ellopos.net/elpenor/rome/4-09-cinna-sulla.asp?pg=58