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 Romans Invade Thessaly
The consul left a strong division in Illyria to harass Macedonia from the west, while with the main force he started, as usual, from Apollonia for Thessaly. Perseus did not think of disturbing their arduous march, but contented himself with advancing into Perrhaebia and occupying the nearest fortresses.
He awaited the enemy at Ossa, and not far from Larisa the first conflict took place between the cavalry and light troops on both sides. The Romans were decidedly beaten. Cotys with the Thracian horse had defeated and broken the Italian, and Perseus with his Macedonian horse the Greek, cavalry; the Romans had 2000 foot and 200 horsemen killed, and 600 horsemen made prisoners, and had to deem themselves fortunate in being allowed to cross the Peneius without hindrance.
Perseus employed the victory to ask peace on the same terms which Philip had obtained: he was ready even to pay the same sum. The Romans refused his request: they never concluded peace after a defeat, and in this case the conclusion of peace would certainly have involved as a consequence the loss of Greece.
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Reference address : https://www.ellopos.net/elpenor/rome/3-10-third-macedonian-war.asp?pg=22