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
Internal Dissension among the Insurgents
What might have come of it, had the national kings from the mountains of Auvergne or of the Balkan, and not runaway gladiatorial slaves, been at the head of the victorious bands, it is impossible to say; as it was, the movement remained notwithstanding its brilliant victories a rising of robbers, and succumbed less to the superior force of its opponents than to internal discord and the want of definite plan. The unity in confronting the common foe, which was so remarkably conspicuous in the earlier servile wars of Sicily, was wanting in this Italian war--a difference probably due to the fact that, while the Sicilian slaves found a quasi-national point of union in the common Syrohellenism, the Italian slaves were separated into the two bodies of Graeco-Barbarians and Celto-Germans.
The rupture between the Celtic Crixus and the Thracian Spartacus--Oenomaus had fallen in one of the earliest conflicts--and other similar quarrels crippled them in turning to account the successes achieved, and procured for the Romans several important victories. But the want of a definite plan and aim produced far more injurious effects on the enterprise than the insubordination of the Celto-Germans. Spartacus doubtless--to judge by the little which we learn regarding that remarkable man--stood in this respect above his party. Along with his strategic ability he displayed no ordinary talent for organization, as indeed from the very outset the uprightness, with which he presided over his band and distributed the spoil, had directed the eyes of the multitude to him quite as much at least as his valour.
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Reference address : https://www.ellopos.net/elpenor/rome/5-02-rule-sullan-restoration.asp?pg=75