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
Preparations of the Anarchists in Etruria
Wearied by all this vain agitation and scheming without result, Catilina determined to push the matter to a decision and make an end of it once for all. He took his measures in the course of the summer to open the civil war. Faesulae (Fiesole), a very strong town situated in Etruria--which swarmed with the impoverished and conspirators--and fifteen years before the centre of the rising of Lepidus, was again selected as the headquarters of the insurrection. Thither were despatched the consignments of money, for which especially the ladies of quality in the capital implicated in the conspiracy furnished the means; there arms and soldiers were collected; and there an old Sullan captain, Gaius Manlius, as brave and as free from scruples of conscience as was ever any soldier of fortune, took temporarily the chief command.
Similar though less extensive warlike preparations were made at other points of Italy. The Transpadanes were so excited that they seemed only waiting for the signal to strike. In the Bruttian country, on the east coast of Italy, in Capua--wherever great bodies of slaves were accumulated--a second slave insurrection like that of Spartacus seemed on the eve of arising. Even in the capital there was something brewing; those who saw the haughty bearing with which the summoned debtors appeared before the urban praetor, could not but remember the scenes which had preceded the murder of Asellio.(19)
19. Cf. IV. VII. Economic Crisis
The capitalists were in unutterable anxiety; it seemed needful to enforce the prohibition of the export of gold and silver, and to set a watch over the principal ports. The plan of the conspirators was--on occasion of the consular election for 692, for which Catilina had again announced himself-- summarily to put to death the consul conducting the election as well as the inconvenient rival candidates, and to carry the election of Catilina at any price; in case of necessity, even to bring armed bands from Faesulae and the other rallying points against the capital, and with their help to crush resistance.
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Reference address : https://www.ellopos.net/elpenor/rome/5-05-parties-pompeius.asp?pg=28