History of the Peloponnesian War

When the army had assembled at Delphi, Eurylochus sent a herald to the Locri Ozole; for the route to Naupactus was through their territory, and moreover he wished to make them revolt from the Athenians.

Those amongst the Locrians who most forwarded his views were the Amphissians, who were alarmed in consequence of the enmity of the Phocians. These first gave hostages themselves, and persuaded the rest to do so, in their fear of the invading army; first the Myoneans, who were their neighbours, (for on this side Locris is most difficult to enter,) then the Ipneans, Messapians, Tritaens, Chalaeans, Tolophonians, Hessians, and Oeantheans. All these joined the expedition also. The Olpnaean gave hostages, but did not accompany them; while the Hyaeans refused to give hostages, till they took a village belonging to them, called Polis.