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
Final Regulation of Greece
Peace was thus established, externally at least, among the petty Greek states. But the internal condition of the several communities also furnished employment to the Roman arbiter. The Boeotians openly displayed their Macedonian tendencies, even after the expulsion of the Macedonians from Greece; after Flamininus had at their request allowed their countrymen who were in the service of Philip to return home, Brachyllas, the most decided partisan of Macedonia, was elected to the presidency of the Boeotian confederacy, and Flamininus was otherwise irritated in every way.
He bore it with unparalleled patience; but the Boeotians friendly to Rome, who knew what awaited them after the departure of the Romans, determined to put Brachyllas to death, and Flamininus, whose permission they deemed it necessary to ask, at least did not forbid them. Brachyllas was accordingly killed; upon which the Boeotians were not only content with prosecuting the murderers, but lay in wait for the Roman soldiers passing singly or in small parties through their territories, and killed about 500 of them.
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Reference address : https://www.ellopos.net/elpenor/rome/3-08-second-macedonian-war.asp?pg=68