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
Antiochus in Greece
For the moment, indeed, Antiochus had anticipated the Romans in Greece proper. Chalcis was garrisoned by the Greek allies of the Romans, and refused the first summons but the fortress surrendered when Antiochus advanced with all his force; and a Roman division, which arrived too late to occupy it, was annihilated by Antiochus at Deliurn. Euboea was thus lost to the Romans. Antiochus still made even in winter an attempt, in concert with the Aetolians and Athamanes, to gain Thessaly; Thermopylae was occupied, Pherae and other towns were taken, but Appius Claudius came up with 2000 men from Apollonia, relieved Larisa, and took up his position there.
Antiochus, tired of the winter campaign, preferred to return to his pleasant quarters at Chalcis, where the time was spent merrily, and the king even, in spite of his fifty years and his warlike schemes, wedded a fair Chalcidian. So the winter of 562-3 passed, without Antiochus doing much more than sending letters hither and thither through Greece: he waged the war --a Roman officer remarked--by means of pen and ink.
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Reference address : https://www.ellopos.net/elpenor/rome/3-09-war-antiochus-asia.asp?pg=19