History of the Peloponnesian War

In like manner the Ambraciotes that were at Olpae sent a messenger to the city of Ambracia, willing them to come to their aid with their whole power, as fearing that those with Eurylochus would not be able to pass by the Acarnanians, and so they should be either forced to fight alone or else have an unsafe retreat.

But the Peloponnesians that were with Eurylochus, as soon as they understood that the Ambraciotes were come to Olpae, dislodging from Proschion went with all speed to assist them; and passing over the river Achelöus, marched through Acarnania, which, by reason of the aids sent to Argos, was now disfurnished. On their right hand they had the city of Stratus and that garrison; on the left, the rest of Acarnania.

Having passed the territory of the Stratians, they marched through Phytia, and again by the utmost limits of Medeon; then through Limnaea; then they went into the territory of the Agraeans, which are out of Acarnania, and their friends:

and getting to the hill Thiamus, which is a desert hill, they marched over it and came down into Argeia when it was now night; and passing between the city of the Argives and the Arcarnanians that kept watch at [the] Wells, came unseen and joined with the Ambraciotes at Olpae.