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
Revolt against Mithradates
In fact, while Pompeius, without troubling himself further as to the threats of the impotent giant, was employed in organizing the territory which he had gained, the destinies of the aged king drew on to their fulfilment without Roman aid in the remote north. His extravagant preparations had produced the most violent excitement among the Bosporans, whose houses were torn down, and whose oxen were taken from the plough and put to death, in order to procure beams and sinews for constructing engines of war. The soldiers too were disinclined to enter on the hopeless Italian expedition. Mithradates had constantly been surrounded by suspicion and treason; he had not the gift of calling forth affection and fidelity among those around him.
As in earlier years he had compelled his distinguished general Archelaus to seek protection in the Roman camp; as during the campaigns of Lucullus his most trusted officers Diodes, Phoenix, and even the most notable of the Roman emigrants had passed over to the enemy; so now, when his star grew pale and the old, infirm, embittered sultan was accessible to no one else save his eunuchs, desertion followed still more rapidly on desertion.
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Reference address : https://www.ellopos.net/elpenor/rome/5-04-pompeius-east.asp?pg=26