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 the younger Tigranes occasioned still greater mischief than that which arose out of his promoting the alliance between the Romans and the Parthians, for his insurrection produced a variance between the kings Tigranes and Mithradates themselves. The great-king cherished in secret the suspicion that Mithradates might have had a hand in the insurrection of his grandson--Cleopatra the mother of the younger Tigranes was the daughter of Mithradates-- and, though no open rupture took place, the good understanding between the two monarchs was disturbed at the very moment when it was most urgently needed.
At the same time Pompeius prosecuted his warlike preparations with energy. The Asiatic allied and client communities were warned to furnish the stipulated contingents. Public notices summoned the discharged veterans of the legions of Fimbria to return to the standards as volunteers, and by great promises and the name of Pompeius a considerable portion of them were induced in reality to obey the call. The whole force united under the orders of Pompeius may have amounted, exclusive of the auxiliaries, to between 40,000 and 50,000 men.(5)
5. Pompeius distributed among his soldiers and officers as presents 384,000,000 sesterces (=16,000 talents, App. Mithr. 116); as the officers received 100,000,000 (Plin. H. N. xxxvii. 2, 16) and each of the common soldiers 6000 sesterces (Plin., App.), the army still numbered at its triumph about 40,000 men.
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Reference address : https://www.ellopos.net/elpenor/rome/5-04-pompeius-east.asp?pg=9