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
If the blame of destroying the old military discipline is on this account attached to him, the censure is not exactly without ground, but yet without justice; he was indeed the first Roman magistrate who was only enabled to discharge his military and political task by coming forward as a -condottiere-. He had not however taken the military dictatorship for the purpose of making the state subject to the soldiery, but rather for the purpose of compelling everything in the state, and especially the army and the officers, to submit once more to the authority of civil order. When this became evident, an opposition arose against him among his own staff.
The oligarchy might play the tyrant as respected other citizens; but that the generals also, who with their good swords had replaced the overthrown senators in their seats, should now be summoned to yield implicit obedience to this very senate, seemed intolerable. The very two officers in whom Sulla had placed most confidence resisted the new order of things. When Gnaeus Pompeius, whom Sulla had entrusted with the conquest of Sicily and Africa and had selected for his son-in-law, after accomplishing his task received orders from the senate to dismiss his army, he omitted to comply and fell little short of open insurrection.
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Reference address : https://www.ellopos.net/elpenor/rome/4-10-sullan-constitution.asp?pg=56