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 left wing of Sulla, which he led in person, gave way as far as the city wall, so that it became necessary to close the city gates; stragglers even brought accounts to Ofella that the battle was lost. But on the right wing Marcus Crassus overthrew the enemy and pursued him as far as Antemnae; this somewhat relieved the left wing also, and an hour after sunset it in turn began to advance. The fight continued the whole night and even on the following morning; it was only the defection of a division of 3000 men, who immediately turned their arms against their former comrades, that put an end to the struggle. Rome was saved. The army of the insurgents, for which there was no retreat, was completely extirpated.
The prisoners taken in the battle--between 3000 and 4000 in number, including the generals Damasippus, Carrinas, and the severely-wounded Pontius-- were by Sulla's orders on the third day after the battle brought to the Villa Publica in the Campus Martius and there massacred to the last man, so that the clatter of arms and the groans of the dying were distinctly heard in the neighbouring temple of Bellona, where Sulla was just holding a meeting of the senate. It was a ghastly execution, and it ought not to be excused; but it is not right to forget that those very men who perished there had fallen like a band of robbers on the capital and the burgesses, and, had they found time, would have destroyed them as far as fire and sword can destroy a city and its citizens.
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Reference address : https://www.ellopos.net/elpenor/rome/4-09-cinna-sulla.asp?pg=50