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
Execution of the Catalinarians
The execution of the decree naturally devolved on the consul, who had called it forth. Late on the evening of the 5th of December the prisoners were brought from their previous quarters, and conducted across the market-place still densely crowded by men to the prison in which criminals condemned to death were wont to be kept. It was a subterranean vault, twelve feet deep, at the foot of the Capitol, which formerly had served as a well-house. The consul himself conducted Lentulus, and praetors the others, all attended by strong guards; but the attempt at rescue, which had been expected, did not take place. No one knew whether the prisoners were being conveyed to a secure place of custody or to the scene of execution.
At the door of the prison they were handed over to the -tresviri- who conducted the executions, and were strangled in the subterranean vault by torchlight. The consul had waited before the door till the executions were accomplished, and then with his loud well-known voice proclaimed over the Forum to the multitude waiting in silence, "They are dead." Till far on in the night the crowds moved through the streets and exultingly saluted the consul, to whom they believed that they owed the security of their houses and their property. The senate ordered public festivals of gratitude, and the first men of the nobility, Marcus Cato and Quintus Catulus, saluted the author of the sentence of death with the name--now heard for the first time--of a "father of his fatherland."
But it was a dreadful deed, and all the more dreadful that it appeared to a whole people great and praiseworthy. Never perhaps has a commonwealth more lamentably declared itself bankrupt, than did Rome through this resolution--adopted in cold blood by the majority of the government and approved by public opinion-- to put to death in all haste a few political prisoners, who were no doubt culpable according to the laws, but had not forfeited life; because, forsooth, the security of the prisons was not to be trusted, and there was no sufficient police. It was the humorous trait seldom wanting to a historical tragedy, that this act of the most brutal tyranny had to be carried out by the most unstable and timid of all Roman statesmen, and that the "first democratic consul" was selected to destroy the palladium of the ancient freedom of the Roman commonwealth, the right of -provocatio-.
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Reference address : https://www.ellopos.net/elpenor/rome/5-05-parties-pompeius.asp?pg=39