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 End of the Republic
The constitutional struggle was at an end; and that it was so, was proclaimed by Marcus Cato when he fell on his sword at Utica. For many years he had been the foremost man in the struggle of the legitimate republic against its oppressors; he had continued it, long after he had ceased to cherish any hope of victory. But now the struggle itself had become impossible; the republic which Marcus Brutus had founded was dead and never to be revived; what were the republicans now to do on the earth? The treasure was carried off, the sentinels were thereby relieved; who could blame them if they departed?
There was more nobility, and above all more judgment, in the death of Cato than there had been in his life. Cato was anything but a great man; but with all that short-sightedness, that perversity, that dry prolixity, and those spurious phrases which have stamped him, for his own and for all time, as the ideal of unreflecting republicanism and the favourite of all who make it their hobby, he was yet the only man who honourably and courageously championed in the last struggle the great system doomed to destruction. Just because the shrewdest lie feels itself inwardly annihilated before the simple truth, and because all the dignity and glory of human nature ultimately depend not on shrewdness but on honesty, Cato has played a greater part in history than many men far superior to him in intellect.
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Reference address : https://www.ellopos.net/elpenor/rome/5-10-brundisium-pharsalus-thapsus.asp?pg=136