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
Sulla Embarks for Italy
The goal was thus attained. After four years of war the Pontic king was again a client of the Romans, and a single and settled government was re-established in Greece, Macedonia, and Asia Minor; the requirements of interest and honour were satisfied, if not adequately, yet so far as circumstances would allow; Sulla had not only brilliantly distinguished himself as a soldier and general, but had the skill, in his path crossed by a thousand obstacles, to preserve the difficult mean between bold perseverance and prudent concession. Almost like Hannibal he had fought and conquered, in order that with the forces, which the first victory gave him, he might prepare forthwith for a second and severer struggle.
After he had in some degree compensated his soldiers for the fatigues which they had undergone by luxurious winter-quarters in the rich west of Asia Minor, he in the spring of 671 transferred them in 1600 vessels from Ephesus to the Piraeeus and thence by the land route to Patrae, where the vessels again lay ready to convey the troops to Brundisium. His arrival was preceded by a report addressed to the senate respecting his campaigns in Greece and Asia, the writer of which appeared to know nothing of his deposition; it was the mute herald of the impending restoration.
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Reference address : https://www.ellopos.net/elpenor/rome/4-08-east-king-mithradates.asp?pg=71