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
Second Peace - Capture of Mytilene
This foolish feud, while it lasted, had postponed the reduction of the Mytilenaeans; it was only after a long siege by land and by sea, in which the Bithynian fleet rendered good service, that Murena's successor succeeded in taking the city by storm (675).
The ten years' revolution and insurrection were at an end in the west and in the east; the state had once more unity of government and peace without and within. After the terrible convulsions of the last years even this rest was a relief. Whether it was to furnish more than a mere relief; whether the remarkable man, who had succeeded in the difficult task of vanquishing the public foe and in the more difficult work of subduing the revolution, would be able to meet satisfactorily the most difficult task of all-- the re-establishing of social and political order shaken to its very foundations--could not but be speedily decided
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Reference address : https://www.ellopos.net/elpenor/rome/4-09-cinna-sulla.asp?pg=59