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 new commander-in-chief immediately had a conference with the king, while the two armies lay face to face inactive. Philip made proposals of peace; he offered to restore all his own conquests, and to submit to an equitable arbitration regarding the damage inflicted on the Greek cities; but the negotiations broke down, when he was asked to give up ancient possessions of Macedonia and particularly Thessaly. For forty days the two armies lay in the narrow pass of the Aous; Philip would not retire, and Flamininus could not make up his mind whether he should order an assault, or leave the king alone and reattempt the expedition of the previous year.
At length the Roman general was helped out of his perplexity by the treachery of some men of rank among the Epirots--who were otherwise well disposed to Macedonia--and especially of Charops. They conducted a Roman corps of 4000 infantry and 300 cavalry by mountain paths to the heights above the Macedonian camp; and, when the consul attacked the enemy's army in front, the advance of that Roman division, unexpectedly descending from the mountains commanding the position, decided the battle. Philip lost his camp and entrenchments and nearly 2000 men, and hastily retreated to the pass of Tempe, the gate of Macedonia proper.
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Reference address : https://www.ellopos.net/elpenor/rome/3-08-second-macedonian-war.asp?pg=50