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
Their Lax and Unsuccessful Management of the War
The wretched Roman commander, however, knew not how or where to attack; the army marched to and fro in Thessaly, without accomplishing anything of importance. Perseus might have assumed the offensive; he saw that the Romans were badly led and dilatory; the news had passed like wildfire through Greece, that the Greek army had been brilliantly victorious in the first engagement; a second victory might lead to a general rising of the patriot party, and, by commencing a guerilla warfare, might produce incalculable results.
But Perseus, while a good soldier, was not a general like his father; he had made his preparations for a defensive war, and, when things took a different turn, he felt himself as it were paralyzed. He made an unimportant success, which the Romans obtained in a second cavalry combai near Phalanna, a pretext for reverting, as is the habit of narrow and obstinate minds, to his first plan and evacuating Thessaly.
This was of course equivalent to renouncing all idea of a Greek insurrection: what might have been attained by a different course was shown by the fact that, notwithstanding what had occurred, the Epirots changed sides. Thenceforth nothing serious was accomplished on either side. Perseus subdued king Genthius, chastised the Dardani, and, by means of Cotys, expelled from Thrace the Thracians friendly to Rome and the Pergamene troops.
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Reference address : https://www.ellopos.net/elpenor/rome/3-10-third-macedonian-war.asp?pg=23