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
The Government of the Restoration as a Whole
Let us look back on the events which fill up the ten years of the Sullan restoration. No one of the movements, external or internal, which occurred during this period--neither the insurrection of Lepidus, nor the enterprises of the Spanish emigrants, nor the wars in Thrace and Macedonia and in Asia Minor, nor the risings of the pirates and the slaves--constituted of itself a mighty danger necessarily affecting the vital sinews of the nation; and yet the state had in all these struggles well-nigh fought for its very existence.
The reason was that the tasks were everywhere left unperformed, so long as they might still have been performed with ease; the neglect of the simplest precautionary measures produced the most dreadful mischiefs and misfortunes, and transformed dependent classes and impotent kings into antagonists on a footing of equality. The democracy and the servile insurrection were doubtless subdued; but such as the victories were, the victor was neither inwardly elevated nor outwardly strengthened by them.
It was no credit to Rome, that the two most celebrated generals of the government party had during a struggle of eight years marked by more defeats than victories failed to master the insurgent chief Sertorius and his Spanish guerillas, and that it was only the dagger of his friends that decided the Sertorian war in favour of the legitimate government. As to the slaves, it was far less an honour to have conquered them than a disgrace to have confronted them in equal strife for years.
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Reference address : https://www.ellopos.net/elpenor/rome/5-02-rule-sullan-restoration.asp?pg=82