Star Wars: Empire at War is a 2006 real-time strategy (RTS) game developed by Petroglyph Games and published by LucasArts. Set between Episode III and Episode IV, it focuses on the fledgling struggle between the Empire and the Rebels. It uses Petroglyph's game engine Alamo. In October 2006, an expansion entitled Star Wars: Empire at War: Forces of Corruption was released.