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
In the Peloponnesus, the Achaean league had united the best elements of Greece proper in a confederacy based on civilization, national spirit, and peaceful preparation for self-defence. But the vigour and more especially the military efficiency of the league had, notwithstanding its outward enlargement, been arrested by the selfish diplomacy of Aratus.
The unfortunate variances with Sparta, and the still more lamentable invocation of Macedonian interference in the Peloponnesus, had so completely subjected the Achaean league to Macedonian supremacy, that the chief fortresses of the country thenceforward received Macedonian garrisons, and the oath of fidelity to Philip was annually taken there.
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Reference address : https://www.ellopos.net/elpenor/rome/3-08-second-macedonian-war.asp?pg=13