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
Battle at Nicopolis
The two armies lay close to each other. During the rest at noon the Roman army set out without the enemy observing the movement, made a circuit, and occupied the heights, which lay in front and commanded a defile to be passed by the enemy, on the southern bank of the river Lycus (Jeschil-Irmak) not far from the modern Enderes, at the point where Nicopolis was afterwards built. The following morning the Pontic troops broke up in their usual manner, and, supposing that the enemy was as hitherto behind them, after, accomplishing the day's march they pitched their camp in the very valley whose encircling heights the Romans had occupied.
Suddenly in the silence of the night there sounded all around them the dreaded battle-cry of the legions, and missiles from all sides poured on the Asiatic host, in which soldiers and camp-followers, chariots, horses, and camels jostled each other; and amidst the dense throng, notwithstanding the darkness, not a missile failed to take effect. When the Romans had expended their darts, they charged down from the heights on the masses which had now become visible by the light of the newly-risen moon, and which were abandoned to them almost defenceless; those that did not fall by the steel of the enemy were trodden down in the fearful pressure under the hoofs and wheels.
It was the last battle-field on which the gray-haired king fought with the Romans. With three attendants--two of his horsemen, and a concubine who was accustomed to follow him in male attire and to fight bravely by his side-- he made his escape thence to the fortress of Sinoria, whither a portion of his trusty followers found their way to him. He divided among them his treasures preserved there, 6000 talents of gold (1,400,000 pounds); furnished them and himself with poison; and hastened with the band that was left to him up the Euphrates to unite with his ally, the great-king of Armenia.
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Reference address : https://www.ellopos.net/elpenor/rome/5-04-pompeius-east.asp?pg=13