History of the Peloponnesian War

Now the Corinthians and their allies on their way to Acarnania were not equipped for fighting at sea, but rather for operations on land, and they had no idea that the Athenians with their twenty ships would dare to bring on an engagement with their own forty-seven. When, however, they saw that the Athenians kept sailing along the opposite coast as long as they themselves continued to skirt the southern shore, and when, as they attempted to cross from Patrae in Achaia to the mainland opposite, making for Acarnania, they observed that the Athenians were bearing down upon them from Chalcis and the river Evenus, and finally when, during the night, they had tried to slip their moorings[*](Or, retaining ὑφορμισάμενοι, they had tried to anchor under cover of night, but had been detected.) and get away but had been detected, under these circumstances they were forced to fight in the middle of the channel.[*](i.e. in the open water between Patrae and the mouth of the Evenus, as opposed to the regions along the shore of the Gulf, where their fleet might run into a harbour.)