History of the Peloponnesian War

Their right wing consisting of the Thebans, and their partakers; in the middle battle were the Haliartians, Coronaeans, Copaeans, and the rest that dwell about the lake; in the left were the Thespians, Tanagraeans, and Orchomenians. The horsemen and light-armed soldiers were placed on either wing. The Thebans were ordered by twentyfive in file; but the rest, every one as it fell out.

This was the preparation and order of the Boeotians.