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
Destruction of Corinth
The communities of Thebes, Chalcis, and Corinth experienced a treatment more severe. There is no ground for censure in the fact that the two former were disarmed and converted by the demolition of their walls into open villages; but the wholly uncalled-for destruction of the flourishing Corinth, the first commercial city in Greece, remains a dark stain on the annals of Rome.
By express orders from the senate the Corinthian citizens were seized, and such as were not killed were sold into slavery; the city itself was not only deprived of its walls and its citadel--a measure which, if the Romans were not disposed permanently to garrison it, was certainly inevitable--but was levelled with the ground, and all rebuilding on the desolate site was prohibited in the usual forms of accursing; part of its territory was given to Sicyon under the obligation that the latter should defray the costs of the Isthmian national festival in room of Corinth, but the greater portion was declared to be public land of Rome.
Thus was extinguished "the eye of Greece," the last precious ornament of the Greek land, once so rich in cities. If, however, we review the whole catastrophe, the impartial historian must acknowledge-- what the Greeks of this period themselves candidly confessed--that the Romans were not to blame for the war itself, but that on the contrary, the foolish perfidy and the feeble temerity of the Greeks compelled the Roman intervention.
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Reference address : https://www.ellopos.net/elpenor/rome/4-01-gracchi.asp?pg=85