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
Great Victories of Spartacus
In Rome people were with reason apprehensive as to the destructive conflagration which was daily spreading. It was resolved next year (682) to send both consuls against the formidable leaders of the gang. The praetor Quintus Arrius, a lieutenant of the consul Lucius Gellius, actually succeeded in seizing and destroying at Mount Garganus in Apulia the Celtic band, which under Crixus had separated from the mass of the robber-army and was levying contributions at its own hand.
But Spartacus achieved all the more brilliant victories in the Apennines and in northern Italy, where first the consul Gnaeus Lentulus who had thought to surround and capture the robbers, then his colleague Gellius and the so recently victorious praetor Arrius, and lastly at Mutina the governor of Cisalpine Gaul Gaius Cassius (consul 681) and the praetor Gnaeus Manlius, one after another succumbed to his blows. The scarcely- armed gangs of slaves were the terror of the legions; the series of defeats recalled the first years of the Hannibalic war.
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Reference address : https://www.ellopos.net/elpenor/rome/5-02-rule-sullan-restoration.asp?pg=74