History of the Peloponnesian War

Nay, it afforded subject of discussion even with the Greeks who were enemies of the Athenians, whether they were not led on by that people on the strength of their alliance, and might not come against them also.

Sitalces then was commanding at once Chalcidice, Bottica, and Macedonia, and was ravaging them all. But when none of the objects for which he made the expedition was being gained by him, and he found his army without provisions and suffering from the severity of the weather, he was persuaded by Seuthes the son of Spardacus, who was his nephew and next in authority to himself, to return with all speed. For Seuthes had been secretly won over by Perdiccas, who promised to give him his sister, and a sum of money with her.

Thus persuaded then, after remaining [in the enemy's country] thirty days in all, and eight of them in Chalcidice, he retired home with his army as quickly as he could: and Perdiccas subsequently gave his sister Stratonice to Seuthes, as he had promised. Such were the events that happened in the expedition of Sitalces.

During this winter, after the fleet of the Peloponnesians had dispersed, the Athenians at Naupactus under the command of Phormio, after coasting along to Astacus, and there disembarking, marched into the interior of Acarnania, with four hundred heavy-armed of the Athenians from the ships and four hundred of the Messenians. From Stratus, Coronta, and some other places, they expelled certain individuals who were not thought to be true to them; and having restored Cynes son of Theolytus to Coronta, returned again to their vessels.

For against the Aeniadae, who alone of the Acarnanians had always been hostile to them, they did not think it possible to march during the winter, as the river Achelous, which flows from Mount Pindus through Dolopia and the country of the Agraeans and Amphilochians and the plain of Acarnania, passing by the town of Stratus in the upper part of its course, and by Aeniadae near its mouth, forms lakes round their city, and so makes it impracticable to lead an army against it in the winter on account of the water.

Opposite to Aeniadae he most of the islands called Echinades, close to the mouths of the Achelous; so that the river, being so large as it is, continually forms depositions round them, and some of the islands have been joined to the continent, as I expect will be the case with all of them in no long period of time.