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
At the former was stationed the great-king, who had shortly before returned from Syria, after having temporarily deferred the prosecution of his plans of conquest on the Mediterranean on account of the embroilment with the Romans. He was just projecting an inroad into Roman Asia from Cilicia and Lycaonia, and was considering whether the Romans would at once evacuate Asia or would previously give him battle, possibly at Ephesus, when the news was brought to him of the advance of Lucullus, which threatened to cut off his communications with Artaxata. He ordered the messenger to be hanged, but the disagreeable reality remained unaltered; so he left the new capital and resorted to the interior of Armenia, in order there to raise a force--which had not yet been done--against the Romans.
Meanwhile Mithrobarzanes with the troops actually at his disposal and in concert with the neighbouring Bedouin tribes, who were called out in all haste, was to give employment to the Romans. But the corps of Mithrobarzanes was dispersed by the Roman vanguard, and the Arabs by a detachment under Sextilius; Lucullus gained the road leading from Tigranocerta to Artaxata, and, while on the right bank of the Tigrisa Roman detachment pursued the great-king retreating northwards, Lucullus himself crossed to the left and marched forward to Tigranocerta.
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Reference address : https://www.ellopos.net/elpenor/rome/5-02-rule-sullan-restoration.asp?pg=44