This city was well secured by fortifications; and also, as an attempt had formerly been made on it, by a strong garrison.

After the taking of Andros, twenty Rhodian ships, all decked vessels, had formed a junction with them, under the command of Agesimbrotus.

This squadron they sent to the station off Zelasium, a promontory of Isthmia, very conveniently situate beyond Demetrias, in order that, if the ships of the Macedonians should attempt any movement, they might act as a defensive force.

Heraclides, the king's admiral, kept his fleet there, rather with a view of laying hold of any advantage which the negligence of the enemy might afford him, than with a design of attempting any thing by open force.

The Romans and king Attalus carried on their attacks against Oreus on different sides; the Romans against the citadel next to the sea, the king's troops against the lower part of the town, lying between the two citadels, where the city is also divided by a wall.