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
Marius with his band which had gradually increased to three legions, and in possession of a number of war-vessels, occupied one place on the coast after another till at length even Ostia fell into his hands through treachery, and, by way of prelude as it were to the approaching reign of terror, was abandoned by the general to the savage band for massacre and pillage. The capital was placed, even by the mere obstruction of traffic, in great danger; by command of the senate the walls and gates were put in a state of defence and the burgess-levy was ordered to the Janiculum. The inaction of Strabo excited among all classes alike surprise and indignation.
The suspicion that he was negotiating secretly with Cinna was natural, but was probably without foundation. A serious conflict in which he engaged the band of Sertorius, and the support which he gave to the consul Octavius when Marius had by an understanding with one of the officers of the garrison penetrated into the Janiculum, and by which in fact the insurgents were successfully beaten off again with much loss, showed that he was far from intending to unite with, or rather to place himself under, the leaders of the insurgents. It seems rather to have been his design to sell his assistance in subduing the insurrection to the alarmed government and citizens of the capital at the price of the consulship for the next year, and thereby to get the reins of government into his own hands.
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Reference address : https://www.ellopos.net/elpenor/rome/4-09-cinna-sulla.asp?pg=10