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
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).
General Peace
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