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
As such a commencement was no sufficient inducement for Antiochus to come to Europe, the Aetolians resolved to possess themselves of Sparta, Chalcis, and Demetrias, and by gaining these important towns to prevail upon the king to embark. In the first place they thought to become masters of Sparta, by arranging that the Aetolian Alexamenus should march with 1000 men into the town under pretext of bringing a contingent in terms of the alliance, and should embrace the opportunity of making away with Nabis and of occupying the town. This was done, and Nabis was killed at a review of the troops; but, when the Aetolians dispersed to plunder the town, the Lacedaemonians found time to rally and slew them to the last man.
The city was then induced by Philopoemen to join the Achaean league. After this laudable project of the Aetolians had thus not only deservedly failed, but had had precisely the opposite effect of uniting almost the whole Peloponnesus in the hands of the other party, it fared little better with them at Chalcis, for the Roman party there called in the citizens of Eretria and Carystus in Euboea, who were favourable to Rome, to render seasonable aid against the Aetolians and the Chalcidian exiles.
On the other hand the occupation of Demetrias was successful, for the Magnetes to whom the city had been assigned were, not without reason, apprehensive that it had been promised by the Romans to Philip as a prize in return for his aid against Antiochus; several squadrons of Aetolian horse moreover managed to steal into the town under the pretext of forming an escort for Eurylochus, the recalled head of the opposition to Rome. Thus the Magnetes passed over, partly of their own accord, partly by compulsion, to the side of the Aetolians, and the latter did not fail to make use of the fact at the court of the Seleucid.
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Reference address : https://www.ellopos.net/elpenor/rome/3-09-war-antiochus-asia.asp?pg=13