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
Tidings successively arrived, that Flaccus, in order not to be crushed by Sulla, had marched past him onward to Asia (668); that Fimbria had set him aside and installed himself in his room (beg. of 669); that Sulla had concluded peace with Mithradates (669-670).
Hitherto Sulla had been silent so far as the authorities ruling in the capital were concerned. Now a letter from him reached the senate, in which he reported the termination of the war and announced his return to Italy; he stated that he would respect the rights conferred on the new burgesses, and that, while penal measures were inevitable, they would light not on the masses, but on the authors of the mischief.
This announcement frightened Cinna out of his inaction: while he had hitherto taken no step against Sulla except the placing some men under arms and collecting a number of vessels in the Adriatic, he now resolved to cross in all haste to Greece.
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Reference address : https://www.ellopos.net/elpenor/rome/4-09-cinna-sulla.asp?pg=26