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
Fresh Difficulties with Mithradates
In the east also, after the embarkation of Sulla in the spring of 671, there had been no cessation of warfare. The restoration of the old state of things and the subjugation of individual towns cost in Asia as in Italy various bloody struggles. Against the free city of Mytilene in particular Lucius Lucullus was obliged at length to bring up troops, after having exhausted all gentler measures; and even a victory in the open field did not put an end to the obstinate resistance of the citizens.
Meanwhile the Roman governor of Asia, Lucius Murena, had fallen into fresh difficulties with king Mithradates. The latter had since the peace busied himself in strengthening anew his rule, which was shaken even in the northern provinces; he had pacified the Colchians by appointing his able son Mithradates as their governor; he had then made away with that son, and was now preparing for an expedition into his Bosporan kingdom. The assurances of Archelaus who had meanwhile been obliged to seek an asylum with Murena,(18) that these preparations were directed against Rome, induced Murena, under the pretext that Mithradates still kept possession of Cappadocian frontier districts, to move his troops towards the Cappadocian Comana and thus to violate the Pontic frontier (671).
18. Cf. IV. VIII. New Difficulties
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Reference address : https://www.ellopos.net/elpenor/rome/4-09-cinna-sulla.asp?pg=57