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
Thus in the summer of 683 the first coalition took place between the democracy on the one hand, and the two Sullan generals Gnaeus Pompeius and Marcus Crassus on the other. The generals adopted the party-programme of the democracy; and they were promised immediately in return the consulship for the coming year, while Pompeius was to have also a triumph and the desired allotments of land for his soldiers, and Crassus as the conqueror of Spartacus at least the honour of a solemn entrance into the capital.
To the two Italian armies, the great capitalists, and the democracy, which thus came forward in league for the overthrow of the Sullan constitution, the senate had nothing to oppose save perhaps the second Spanish army under Quintus Metellus Pius. But Sulla had truly predicted that what he did would not be done a second time; Metellus, by no means inclined to involve himself in a civil war, had discharged his soldiers immediately after crossing the Alps. So nothing was left for the oligarchy but to submit to what was inevitable. The senate granted the dispensations requisite for the consulship and triumph; Pompeius and Crassus were, without opposition, elected consuls for 684, while their armies, on pretext of awaiting their triumph, encamped before the city. Pompeius thereupon, even before entering on office, gave his public and formal adherence to the democratic programme in an assembly of the people held by the tribune Marcus Lollius Palicanus. The change of the constitution was thus in principle decided.
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Reference address : https://www.ellopos.net/elpenor/rome/5-03-fall-oligarchy-pompeius.asp?pg=12