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
Lucullus Crosses the Euphrates
The mission of Appius Claudius was designed not only to furnish a diplomatic pretext for the war, but also to induce the princes and cities of Syria especially to take arms against the great-king: in the spring of 685 the formal attack began. During the winter the king of Cappadocia had silently provided vessels for transport; with these the Euphrates was crossed at Melitene, and the further march was directed by way of the Taurus-passes to the Tigris. This too Lucullus crossed in the region of Amida (Diarbekr), and advanced towards the road which connected the second capital Tigranocerta,(16) recently founded on the south frontier of Armenia, with the old metropolis Artaxata.
16. That Tigranocerta was situated in the region of Mardln some two days' march to the west of Nisibis, has been proved by the investigation instituted on the spot by Sachau ("-Ueber die Lage von Tigranokerta-," Abh. der Berliner Akademie, 1880), although the more exact fixing of the locality proposed by Sachau is not beyond doubt. On the other hand, his attempt to clear up the campaign of Lucullus encounters the difficulty that, on the route assumed in it, a crossing of the Tigris is in reality out of the question.
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Reference address : https://www.ellopos.net/elpenor/rome/5-02-rule-sullan-restoration.asp?pg=43