Because it is located strategically on the maritime route to Italy, Acarnania was involved in many wars. Their hatred against the Corinthian settlers, who had deprived them of all their best ports, naturally led the Acarnanians to side with the Athenians; but the immediate cause of their alliance with the latter arose from the expulsion of the Amphilochians from the town of Argos Amphilochicum by the Corinthian settlers from Ambracia, about 432 BC. The Acarnanians espoused the cause of the expelled Amphilochians, and in order to obtain the restoration of the latter, they applied for assistance to Athens. The Athenians accordingly sent an expedition under Phormio, who took Argos, expelled the Ambraciots, and restored the town to the Amphilochians and Acarnanians. An alliance was now formally concluded between the Acarnamians and Athenians. The only towns of Acarnania which did not join it were Oeniadae and Astacus.