History of the Peloponnesian War

The army having assembled at Delphi, Eurylochus sent a herald to the Ozolian Locrians; the road to Naupactus lying through their territory, and he having besides conceived the idea of detaching them from Athens.

His chief abettors in Locris were the Amphissians, who were alarmed at the hostility of the Phocians. These first gave hostages themselves, and induced the rest to do the same for fear of the invading army; first, their neighbors the Myonians, who held the most difficult of the passes, and after them the Ipnians, Messapians, Tritaeans, Chalaeans, Tolophonians, Hessians, and Oeanthians, all of whom joined in the expedition; the Olpaeans contenting themselves with giving hostages, without accompanying the invasion; and the Hyaeans refusing to do either, until the capture of Polis, one of their villages.