The Thebans had taken advantage of Alexander's absence from Greece to revolt against Macedonian domination. The city was destroyed and its inhabitants were enslaved to serve as an example.
Bouchard, Elsa. "Destruction of Thebes". The Literary Encyclopedia. First published 01 March 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=11281, accessed 23 August 2014.]