History of the Peloponnesian War

So Aristarchus, after first making his plans known to the besiegers, deceived the garrison at Oenoe by telling them that their partisans in the city had made terms with the Lacedaemonians, and that, among other things, this garrison must surrender the place to the Boeotians; for the agreement had been made on these conditions. The garrison trusted him because he was a general, being in complete ignorance because they were in a state of siege, and evacuated the fort under a truce.