History of the Peloponnesian War

[and he built it] on the Ambracian Gulf, and called it Argos after the name of his own country.

This was the largest city of Amphilochia, and had the most powerful inhabitants. But many generations afterwards, being pressed by misfortunes, they called in the Ambraciots, who bordered on Amphilochia, as joint-inhabitants; and from the Ambraciots who joined them they were taught the Greek language which they now speak, the rest of the Amphilochians being barbarians.

Now the Ambraciots in process of time drove out the Argives, and held the city by themselves.

Upon this the Amphilochians gave themselves up to the Acarnanians; and both together having called in the Athenians, who sent them Phormio for a general and thirty ships, on the arrival of Phormio they took Argos by storm, and made slaves of the Ambraciots;

while the Amphilochians and Acarnanians occupied the town in common.

And it was after this event that the alliance between the Athenians and Acarnanians was first made. The Ambraciots then first conceived their enmity to the Argives from this enslavement of their people; and afterwards, during the war, formed this armament from themselves and the Chaonians, and some other of the neighboring barbarians. Having come to Argos, they obtained command of the country; but being unable to take the city by assault, they retired homeward, and disbanding returned to their different nations. These were the events of the summer.