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
Since the spring of 562 Flamininus, by direction of the senate, had journeyed through Greece to thwart the intrigues of the opposite party, and to counteract as far as possible the evil effects of the ill-timed evacuation of the country. The Aetolians had already gone so far as formally to declare war in their diet against Rome. But Flamininus succeeded In saving Chalcis for the Romans by throwing into it a garrison of 500 Achaeans and 500 Pergamenes. He made an attempt also to recover Demetrias; and the Magnetes wavered.
Though some towns in Asia Minor, which Antiochus had proposed to subdue before beginning the great war, still held out, he could now no longer delay his landing, unless he was willing to let the Romans recover all the advantages which they had surrendered two years before by withdrawing their garrisons from Greece. He collected the vessels and troops which were at hand--he had but 40 decked vessels and 10,000 infantry, along with 500 horse and 6 elephants--and started from the Thracian Chersonese for Greece, where he landed in the autumn of 562 at Pteleum on the Pagasaean gulf, and immediately occupied the adjoining Demetrias. Nearly about the same time a Roman army of some 25,000 men under the praetor Marcus Baebius landed at Apollonia. The war was thus begun on both sides.
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Reference address : https://www.ellopos.net/elpenor/rome/3-09-war-antiochus-asia.asp?pg=15