 According to Müller, the state of Elis in Arcadia, allies of the Aetolians, provided a guide (Oxylus) for passage through Arcadia after crossing the Gulf of Corinth from Naupactus.Arcadia gave them a central point from which to attack anywhere else in the Peloponnesus.Their presence was contested by a united Peloponnesian Achaean army (except for Arcadia) under Tisamenus, an Atreid.