History of the Peloponnesian War

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.