The Battle of Wol Cabassh was one of the last battles of the Clone Wars.
Vel Orset commanded the Republic side of the battle. About halfway through, the battle was almost completely in favor of the Republic. Soon after, many of the Trade Federation cruisers were destroyed and the battle was almost won. As the last cruiser was destroyed, however, the clone troopers turned on Orset through Order 66 and killed him after being shot at by an AT-TE.
Wol Cabassh remained in control of the Empire after the droids were shut down on Mustafar.