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.
Landing of the Romans In the beginning of spring 563 the Roman staff arrived at Apollonia.
The commander-in-chief was Manius Acilius Glabrio, a man of humble origin, but an able general feared both by his soldiers and by the enemy; the admiral was Gaius Livius; and among the military tribunes were Marcus Porcius Cato, the conqueror of Spain, and Lucius Valerius Flaccus, who after the old Roman wont did not disdain, although they had been consuls, to re-enter the army as simple war-tribunes.

They brought with them reinforcements in ships and men, including Numidian cavalry and Libyan elephants sent by Massinissa, and the permission of the senate to accept auxiliary troops to the number of 5000 from the extra-Italian allies, so that the whole number of the Roman forces was raised to about 40,000 men.