The Rhodians had on the right wing the Achaeans; on the left mercenary soldiers; and in the centre a chosen band of infantry, a body of auxiliaries composed of troops of various nations.
The cavalry and what light infantry they had, were posted on the wings.

During that day both armies remained on the banks of a rivulet, which ran between them, and, after discharging a few javelins, they retired into their camps.

Next day, being drawn up in the same order, they fought a more important battle than could have been expected, considering the numbers engaged; for there were not more than three thousand infantry on each side, and about one hundred horse: but they were not only on an equality with respect to numbers, and the kind of arms which they used, but they also fought with equal spirit and equal hopes.

First, the Achaeans crossing the rivulet, made an attack on the Agrians; then the whole line passed the river, almost at full speed.
The fight continued doubtful a long time: the Achaeans, one thousand in number, drove back the four hundred from their position.

Then the left wing giving way, all exerted themselves against the right.