History of the Peloponnesian War

On their part, the Ambraciots at Olpae sent a messenger to their own city, to beg them to come with their whole levy to their assistance, fearing that the army of Eurylochus might not be able to pass through the Acarnanians, and that they might themselves be obliged to fight single-handed, or be unable to retreat, if they wished it, without danger.

Meanwhile Eurylochus and his Peloponnesians, learning that the Ambraciots at Olpae had arrived, set out from Proschium with all haste to join them, and crossing the Achelous advanced through Acarnania, which they found deserted by its population, who had gone to the relief of Argos; keeping on their right the city of the Stratians and its garrison, and on their left the rest of Acarnania.

Traversing the territory of the Stratians, they advanced through Phytia, next, skirting Medeon, through Limnaea; after which they left Acarnania behind them and entered a friendly country, that of the Agraeans.

From thence they reached and crossed Mount Thyamus, which belongs to the Agraeans, and descended into the Argive territory after nightfall, and passing between the city of Argos and the Acarnanian posts at Krenae, joined the Ambraciots at Olpae.