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
Destruction of the Pontic Army
Meanwhile Lucullus had possessed himself of a very strong position in rear of the Pontic army, which, although not permitting him directly to relieve the hard-pressed city, gave him the means of cutting off all supplies by land from the enemy. Thus the enormous army of Mithradates, estimated with the camp-followers at 300,000 persons, was not in a position either to fight or to march, firmly wedged in between the impregnable city and the immoveable Roman army, and dependent for all its supplies solely on the sea, which fortunately for the Pontic troops was exclusively commanded by their fleet. But the bad season set in; a storm destroyed a great part of the siege-works; the scarcity of provisions and above all of fodder for the horses began to become intolerable.
The beasts of burden and the baggage were sent off under convoy of the greater portion of the Pontic cavalry, with orders to steal away or break through at any cost; but at the river Rhyndacus, to the east of Cyzicus, Lucullus overtook them and cut to pieces the whole body. Another division of cavalry under Metrophanes and Lucius Fannius was obliged, after wandering long in the west of Asia Minor, to return to the camp before Cyzicus. Famine and disease made fearful ravages in the Pontic ranks.
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Reference address : https://www.ellopos.net/elpenor/rome/5-02-rule-sullan-restoration.asp?pg=31