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
So the Roman army remained, during the rest of the summer and the winter, hemmed in in the farthest corner of Thessaly; and, while the crossing of the passes was certainly a success and the first substantial one in the war, it was due not to the ability of the Roman, but to the blundering of the Macedonian, general. The Roman fleet in vain attempted the capture of Demetrias, and performed no exploit whatever.
The light ships of Perseus boldly cruised between the Cyclades, protected the corn-vessels destined for Macedonia, and attacked the transports of the enemy. With the western army matters were still worse: Appius Claudius could do nothing with his weakened division, and the contingent which he asked from Achaia was prevented from coming to him by the jealousy of the consul. Moreover, Genthius had allowed himself to be bribed by Perseus with the promise of a great sum of money to break with Rome, and to imprison the Roman envoys; whereupon the frugal king deemed it superfluous to pay the money which he had promised, since Genthius was now forsooth compelled, independently of it, to substitute an attitude of decided hostility to Rome for the ambiguous position which he had hitherto maintained.
Accordingly the Romans had a further petty war by the side of the great one, which had already lasted three years. In fact had Perseus been able to part with his money, he might easily have aroused enemies still more dangerous to the Romans. A Celtic host under Clondicus--10,000 horsemen and as many infantry--offered to take service with him in Macedonia itself; but they could not agree as to the pay. In Greece too there was such a ferment that a guerilla warfare might easily have been kindled with a little dexterity and a full exchequer; but, as Perseus had no desire to give and the Greeks did nothing gratuitously, the land remained quiet.
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Reference address : https://www.ellopos.net/elpenor/rome/3-10-third-macedonian-war.asp?pg=29