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 Roman vanguard dispersed; a Paelignian cohort was overthrown and almost annihilated; the legions themselves hurriedly retreated till they reached a hill close upon the Roman camp. Here the fortune of the day changed. The uneven ground and the hurried pursuit had disordered the ranks of the phalanx; the Romans in single cohorts entered at every gap, and attacked it on the flanks and in rear; the Macedonian cavalry which alone could have rendered aid looked calmly on, and soon fled in a body, the king among the foremost; and thus the fate of Macedonia was decided in less than an hour.
The 3000 select phalangites allowed themselves to be cut down to the last man; it was as if the phalanx, which fought its last great battle at Pydna, had itself wished to perish there. The overthrow was fearful; 20,000 Macedonians lay on the field of battle, 11,000 were prisoners. The war was at an end, on the fifteenth day after Paullus had assumed the command; all Macedonia submitted in two days. The king fled with his gold--he still had more than 6000 talents (1,460,000 pounds) in his chest--to Samothrace, accompanied by a few faithful attendants.
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Reference address : https://www.ellopos.net/elpenor/rome/3-10-third-macedonian-war.asp?pg=32