History of the Peloponnesian War

For communications respecting the affairs of Boeotia were being carried on with Hippocrates and him by certain men in the cities, who wished to change the constitution, and to bring them under a democracy like that of Athens; it being especially under the direction of Ptoeodorus, an exile from Thebes, that these preparations were made by them.

A party was to betray to them Siphae, a seaport town in the Thespian territory, on the Crisaean Bay; while Chaeronea, which was dependent on what was formerly called the Minyan, but now the Boeotian Orchomenus, was to be delivered up by another party in that city; the exiles from it also co-operating most warmly, and raising mercenary troops from the Peloponnese. Chaeronea is the frontier town too of Boeotia, near to Phanotis in Phocis, and a party of Phocians joined in the design. On the other hand, the Athenians were to seize Delium, the sanctuary of Apollo in the territory of Tanagra, looking towards Euboea;

and these measures were to be simultaneously executed on the same day; that the Boeotians might not oppose them in a body at Delium, but have to attend to their own respective neighbourhoods that were being revolutionized.