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
But as an accident saved him then, so the incapacity of Perseus saved him now. As if he could not comprehend the idea of defending himself against the Romans otherwise than by blocking the passes, he strangely gave himself over as lost as soon as he saw the Romans on the Macedonian side of them, fled in all haste to Pydna, and ordered his ships to be burnt and his treasures to be sunk.
But even this voluntary retreat of the Macedonian army did not rescue the consul from his painful position. He advanced indeed without hindrance, but was obliged after four days' march to turn back for want of provisions; and, when the king came to his senses and returned in all haste to resume the position which he had abandoned, the Roman army would have been in great danger, had not the impregnable Tempe surrendered at the right moment and handed over its rich stores to the enemy. The communication with the south was by this means secured to the Roman army; but Perseus had strongly barricaded himself in his former well-chosen position on the bank of the little river Elpius, and there checked the farther advance of the Romans.
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Reference address : https://www.ellopos.net/elpenor/rome/3-10-third-macedonian-war.asp?pg=28