The Ambush on Lehon, codenamed Operation Judgment by the New Sith Imperium, was a battle that took place on Lehon in 1,011 ABY. Originally planned to ambush Darth Judicar by the Imperial Knights after Ein Morgenroete was interrogated, it was actually a Sith plot orchestrated by Darth Judicar, Ein Morgenroete, and Geist Weiss. In the ensuing battle, Iona Peller and Darth Judicar dueled. Judicar slew Peller, but was injured in the process. This weakness was exploited by Judicar's apprentice, Darth Exodeus, who attempted to kill Judicar and stole the throne of the Sith Empire for himself. With Peller dead, Bellatrix La Rouge became the new leader of the Imperial Knights.