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
Weak Counterpreparatons of the Romans
However much it was in itself a political necessity for Rome to declare war against Mithradates, yet the particular moment was as unhappily chosen as possible; and for this reason it is very probable that Manius Aquillius brought about the rupture between Rome and Mithradates at this precise time primarily from regard to his own interests. For the moment they had no other troops at their disposal in Asia than the small Roman division under Lucius Cassius and the militia of western Asia, and, owing to the military and financial distress in which they were placed at home in consequence of the insurrectionary war, a Roman army could not in the most favourable case land in Asia before the summer of 666.
Hitherto the Roman magistrates there had a difficult position; but they hoped to protect the Roman province and to be able to hold their ground as they stood--the Bithynian army under king Nicomedes in its position taken up in the previous year in the Paphlagonian territory between Amastris and Sinope, and the divisions under Lucius Cassius, Manius Aquillius, and Quintus Oppius, farther back in the Bithynian, Galatian, and Cappadocian territories, while the Bithyno-Roman fleet continued to blockade the Bosporus.
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Reference address : https://www.ellopos.net/elpenor/rome/4-08-east-king-mithradates.asp?pg=39