History of the Peloponnesian War

Now the Peloponnesian forces under Eurylochus, when they learned that the Ambraciots had arrived at Olpae, set out from Proschium with all speed to reinforce them, and crossing the Acheloiis advanced through Acarnania, which was without defenders because of the reinforcements which had been sent to Argos, and as they advanced they had the city of Stratus with its garrison on their right, and the rest of Acarnania on their left.

Then traversing the territory of the Stratians they advanced through Phytia, from there skirted the borders of Medeon, and then passed through Limnaea; and finally they reached the country of the Agraeans, being now outside of Acarnania and in a friendly country.

Arriving next at Mt. Thyamus, which belongs to the Agraeans, they went through the pass over it and came down into Argive territory after nightfall, whence they succeeded in passing unobserved between the city of Argos and the Acarnanian guard at Crenae, finally joining the Ambraciots at Olpae.