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
Then the vizier rode in front of the Roman camp to offer, in the name of his king, peace and friendship to the Romans, and to propose a personal conference between the two generals. The Roman army, demoralized as it was, adjured and indeed compelled its leader to accept the offer. The vizier received the consular and his staff with the usual honours, and offered anew to conclude a compact of friendship; only, with just bitterness recalling the fate of the agreements concluded with Lucullus and Pompeius respecting the Euphrates boundary,(9) he demanded that it should be immediately reduced to writing.
9. Cf. V. IV. Difficulty with the Parthians
A richly adorned horse was produced; it was a present from the king to the Roman commander-in-chief; the servants of the vizier crowded round Crassus, zealous to mount him on the steed. It seemed to the Roman officers as if there was a design to seize the person of the commander-in-chief; Octavius, unarmed as he was, pulled the sword of one of the Parthians from its sheath and stabbed the groom. In the tumult which thereupon arose, the Roman officers were all put to death; the gray-haired commander- in-chief also, like his grand-uncle,(10) was unwilling to serve as a living trophy to the enemy, and sought and found death.
10. Cf. IV. I. War against Aristonicus
Do you see any typos or other mistakes? Please let us know and correct them
Reference address : https://www.ellopos.net/elpenor/rome/5-09-crassus-joint-rulers.asp?pg=13