History of the Peloponnesian War

But the Acarnanians at first thought that all alike were flying without permission, and began to pursue the Peloponnesians; and when some even of their generals tried to stop them, and said that permission had been granted to the Peloponnesians, one or two men threw their darts at them, believing that they were being betrayed.

Afterwards, however, they let the Mantineans and Peloponnesians go away, but killed the Ambraciots. And there was much contention and difficulty in distinguishing whether a man was an Ambraciot or a Peloponnesian. They killed some two hundred of them; the rest escaped into Agraea, a bordering territory, and Salaethus, king of the Agraeans, being their friend, received them.