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
In the same manner Tuder in Umbria was stormed by Marcus Crassus. A longer resistance was offered in Etruria by Populonium and above all by the impregnable Volaterrae, which gathered out of the remains of the beaten party an army of four legions, and stood a two years' siege conducted first by Sulla in person and then by the former praetor Gaius Carbo, the brother of the democratic consul, till at length in the third year after the battle at the Colline gate (675) the garrison capitulated on condition of free departure.
But in this terrible time neither military law nor military discipline was regarded; the soldiers raised a cry of treason and stoned their too compliant general; a troop of horse sent by the Roman government cut down the garrison as it withdrew in terms of the capitulation. The victorious army was distributed throughout Italy, and all the insecure townships were furnished with strong garrisons: under the iron hand of the Sullan officers the last palpitations of the revolutionary and national opposition slowly died away.
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Reference address : https://www.ellopos.net/elpenor/rome/4-09-cinna-sulla.asp?pg=53