History of the Peloponnesian War

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.

The Ambraciots from the city arrived at Idomene. This town consists of two high hills; the greater of which, after night had come on, the troops sent forward from the camp by Demosthenes preoccupied unobserved; while the Ambraciots had previously ascended the smaller, and bivouaeked on it. Demosthenes, after supper, marched with the rest of the army as soon as it was evening;

himself with half of his force making for the pass, the remainder proceeding over the mountains of Amphilochia.

At dawn of day he fell upon the Ambraciots, while they were yet in their beds, and had had no notice of his measures, but much rather imagined that his forces were their own countrymen.