History of the Peloponnesian War

At dawn he fell upon the Ambraciots while they were still abed, ignorant of what had passed, and fully thinking that it was their own countrymen,—

Demosthenes having purposely put the Messenians in front with orders to address them in the Doric dialect, and thus to inspire confidence in the sentinels, who would not be able to see them, as it was still night.