While the rest of the ships took their station for the winter at Corcyra, a division under Gaius Claudius Cento proceeded to the Piraeeus to render assistance to the hard-pressed Athenians.

But, as Cento found the Attic territory already sufficiently protected against the raids of the Corinthian garrison and the Macedonian corsairs, he sailed on and appeared suddenly before Chalcis in Euboea, the chief stronghold of Philip in Greece, where his magazines, stores of arms, and prisoners were kept, and where the commandant Sopater was far from expecting a Roman attack.

The undefended walls were scaled, and the garrison was put to death; the prisoners were liberated and the stores were burnt; unfortunately, there was a want of troops to hold the important position.

On receiving news of this invasion, Philip immediately in vehement indignation started from Demetrias in Thessaly for Chalcis, and when he found no trace of the enemy there save the scene of ruin, he went on to Athens to retaliate.

But his attempt to surprise the city was a failure, and even the assault was in vain, greatly as the king exposed his life; the approach of Gaius Claudius from the Piraeeus, and of Attalus from Aegina, compelled him to depart.
Philip still tarried for some time in Greece; but in a political and in a military point of view his successes were equally insignificant.
In vain he tried to induce the Achaeans to take up arms in his behalf; and equally fruitless were his attacks on Eleusis and the Piraeeus, as well as a second attempt on Athens itself.