History of the Peloponnesian War

Now tidings were brought to Demosthenes and the Acarnanians, that the Ambraciots at home, in compliance with the first message from Olpae, were marching in full force with succours through Amphilochia, with a wish to join their countrymen at Olpae, and knowing nothing of what had happened.

Accordingly he straightway sent a division to lay ambushes beforehand in the roads, and to preoccupy the strong positions; while with the rest of his army he prepared to march against them.