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
But Pompeius paused not here. The province of Corduene, to which both Phraates and Tigranes laid claim, was at the command of Pompeius occupied by Roman troops for the latter, and the Parthians who were found in possession were driven beyond the frontier and pursued even as far as Arbela in Adiabene, without the government of Ctesiphon having even been previously heard (689). Far the most suspicious circumstance however was, that the Romans seemed not at all inclined to respect the boundary of the Euphrates fixed by treaty.
On several occasions Roman divisions destined from Armenia for Syria marched across Mesopotamia; the Arab emir Abgarus of Osrhoene was received under singularly favourable conditions into Roman protection; nay, Oruros, situated in Upper Mesopotamia somewhere between Nisibis and the Tigris 220 miles eastward from the Commagenian passage of the Euphrates, was designated as the eastern limit of the Roman dominion-- presumably their indirect dominion, inasmuch as the larger and more fertile northern half of Mesopotamia had been assigned by the Romans in like manner with Corduene to the Armenian empire.
The boundary between Romans and Parthians thus became the great Syro-Mesopotamian desert instead of the Euphrates; and this too seemed only provisional. To the Parthian envoys, who came to insist on the maintenance of the agreements--which certainly, as it would seem, were only concluded orally--respecting the Euphrates boundary, Pompeius gave the ambiguous reply that the territory of Rome extended as far as her rights.
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Reference address : https://www.ellopos.net/elpenor/rome/5-04-pompeius-east.asp?pg=47