History of the Peloponnesian War

Meanwhile Orestes, son of Echecratidas, the Thessalian king, being an exile from Thessaly, persuaded the Athenians to restore him. Taking with them the Boeotians and Phocians their allies, the Athenians marched to Pharsalus in Thessaly. They became masters of the country, though only in the immediate vicinity of the camp; beyond which they could not go for fear of the Thessalian cavalry. But they failed to take the city or to attain any of the other objects of their expedition, and returned home with Orestes without having effected anything.

Not long after this a thousand of the Athenians embarked in the vessels that were at Pegae (Pegae, it must be remembered, was now theirs), and sailed along the coast to Sicyon under the command of Pericles, son of Xanthippus. Landing in Sicyon and defeating the Sicyonians who engaged them,

they immediately took with them the Achaeans, and sailing across, marched against and laid siege to Oeniadae in Acarnania. Failing however to take it, they returned home.

Three years afterwards a truce was made between the Peloponnesians and Athenians for five years.