History of the Peloponnesian War

It was in the first days of the winter following that the places in Boeotia were to be put into the hands of Athenian generals, Hippocrates and Demosthenes, the latter of whom was to go with his ships to Siphae, the former to Delium. A mistake, however, was made in the days on which they were each to start; and Demosthenes sailing first to Siphae, with the Acarnanians and many of the allies from those parts on board, failed to effect anything, through the plot having been betrayed by Nicomachus, a Phocian from Phanotis, who told the Lacedaemonians, and they the Boeotians.

Succours accordingly flocked in from all parts of Boeotia, Hippocrates not being yet there to make his diversion, and Siphae and Chaeronea were promptly secured, and the conspirators, informed of the mistake, did not venture on any movement in the towns.