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 Populares were beaten and driven up to the Capitol, where the supply of water was cut off from them and they were thus compelled to surrender. Marius, who held the chief command, would gladly have saved the lives of his former allies who were now his prisoners; Saturninus proclaimed to the multitude that all which he had proposed had been done in concert with the consul: even a worse man than Marius was could not but shudder at the inglorious part which he played on this day. But he had long ceased to be master of affairs.
Without orders the youth of rank climbed the roof of the senate-house in the Forum where the prisoners were temporarily confined, stripped off the tiles, and with these stoned their victims. Thus Saturninus perished with most of the more notable prisoners. Glaucia was found in a lurking-place and likewise put to death. Without sentence or trial there died on this day four magistrates of the Roman people--a praetor, a quaestor, and two tribunes of the people--and a number of other well-known men, some of whom belonged to good families.
In spite of the grave faults by which the chiefs had invited on themselves this bloody retribution, we may nevertheless lament them: they fell like advanced posts, which are left unsupported by the main army and are forced to perish without aim in a conflict of despair.
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Reference address : https://www.ellopos.net/elpenor/rome/4-06-marius-revolution-drusus-reform.asp?pg=32