History of the Peloponnesian War

In accordance with this advice, and after a stay of thirty days in all, eight of which were spent in Chalcidice, he retired home as quickly as he could; and Perdiccas afterwards gave his sister Stratonice to Seuthes as he had promised. Such was the history of the expedition of Sitalces.

In the course of this winter, after the dispersion of the Peloponnesian fleet, the Athenians in Naupactus, under Phormio, coasted along to Astacus, and disembarked, and marched into the interior of Acarnania with four hundred Athenian heavy infantry and four hundred Messenians. After expelling some suspected persons from Stratus, Coronta, and other places, and restoring Cynes, son of Theolytus, to Coronta, they returned to their ships,

deciding that it was impossible in the winter season to march against Oeniadae, a place which, unlike the rest of Acarnania, had been always hostile to them; for the river Achelous flowing from Mount Pindus through Dolopia and the country of the Agraeans and Amphilochians and the plain of Acarnania, past the town of Stratus in the upper part of its course, forms lakes where it falls into the sea round Oeniadae, and thus makes it impracticable for an army in winter by reason of the water.

Opposite to Oeniadae lie most of the islands called Echinades, so close to the mouths of the Achelous that that powerful stream is constantly forming deposits against them, and has already joined some of the islands to the continent, and seems likely in no long while to do the same with the rest.

For the current is strong, deep, and turbid, and the islands are so thick together that they serve to imprison the alluvial deposit and prevent its dispersing, lying, as they do, not in one line, but irregularly, so as to leave no direct passage for the water into the open sea.