Strabo, Geography
H.C. Hamilton, Esq., W. Falconer, M.A., Ed.

Ephorus does not say that they took part in the expedition against Troy; but he says that Alcmæon, the son of Amphiaraus, who was the companion of Diomede, and the other Epigoni in their expedition, having brought the war against the Thebans to a successful issue, went with Diomede to assist in punishing the enemies of Œneus, and having delivered up Ætolia to Diomede, he himself passed over into Acarnania, which country also he subdued. In the mean time Agamemnon attacked the Argives, and easily overcame them, the greatest part having attached themselves to the followers of Diomede. But a short time afterwards, when the expedition took place against Troy, he was afraid, lest, in his absence with the army, Diomede and his troops should return home, (for there was a rumour that he had collected a large force,) and should regain possession of a territory to which they had the best right, one being the heir of Adrastus, the other of his father. Reflecting then on these circumstances, he invited them to unite in the recovery of Argos, and to take part in the war. Diomede consented to take part in the expedition, but Alcmæon was indignant and refused; whence the Acarnanians were the only people who did not participate in the expedition with the Greeks. The Acarnanians, probably by following this account, are said to have imposed upon the Romans, and to have obtained from them the privilege of an independent state, because they alone had not taken part in the expedition against the ancestors of the Romans, for their names are neither in the Ætolian Catalogue, nor are they mentioned by themselves, nor is their name mentioned anywhere in the poem.