History of the Peloponnesian War

But many generations later the Amphilochians, under the stress of misfortunes, invited in the Ambraciots, who bordered on Amphilochia, to share the place with them, and these first became Hellenes and adopted their present dialect in consequence of their union with the Ambraciots;

but the rest of the Amphilochians are still barbarians. Now in course of time the Ambraciots expelled the Argives and themselves seized the city.

But the Amphilochians, when this happened, placed themselves under the protection of the Acarnanians, and together they called in the Athenians, who sent to them Phormio as general with thirty ships. On the arrival of Phormio they took Argos by storm and reduced the Ambraciots to slavery, and Amphilochians and Acarnanians settled there together.

It was after this that the alliance between the Athenians and the Acarnanians was first established.