Battle of the Ywllandr system A battle occurred in the Ywllandr system in 19 BBY , during the final days of the Clone Wars , as part of the Outer Rim Sieges . Following the Battle of Coruscant , Jedi General Plo Koon — overseeing a small Republic Navy fleet from the Republic flagship " Courageous " — pursued Confederate forces to the Ywllandr system , which had been established as a choke point along the Entralla Route to hinder Republic activity in the surrounding parts of the Outer Rim Territories . The ensuing engagement resulted in heavy fighting , with Koon eventually triumphing over the Confederate forces . His victory allowed Jedi Master Ki - Adi - Mundi ' s clone trooper detachment to move in and assault the nearby world of Mygeeto , while Koon was reassigned to command a campaign at Cato Neimoidia . Prelude . By 19 BBY , the final year of the Clone Wars , the Confederacy of Independent Systems took control of the Ywllandr system in the region of the galaxy known as the New Territories . In taking the star system , which laid on the Entralla Route hyperlane , the Confederacy converted it into a choke point , forcing Galactic Republic starships and naval fleets that were bound for other areas of the Outer Rim Territories to pass through the enemy - controlled system . The system became an area of interest when the Republic targeted Separatist holdings throughout the Outer Rim in a campaign termed the Outer Rim Sieges . Following the Confederate Navy ' s retreat at the Battle of Coruscant , Jedi General Plo Koon , a member of the Jedi High Council , led a Republic Navy strike force in pursuit of the Separatists . His task force chased them from the galactic capital of Coruscant and along the Entralla Route to the Ywllandr system , where they began an offensive to repel the Separatists from the system . The battle . Commanding his small fleet from the bridge of the Republic flagship " Courageous " , Koon oversaw the Republic ' s assault on the Confederate forces , focusing on breaking the Ywllandr system ' s choke point . During the heavy fighting that followed , Koon participated in a meeting with the other Jedi Masters of the Jedi Council via holograph ic connection from " Courageous " bridge , regarding their plan to have Jedi Knight Anakin Skywalker spy on Supreme Chancellor Palpatine . His fleet eventually overpowered the Separatist defenses , severing their hold on the system . Aftermath . Koon ' s victory in the Ywllandr system allowed Jedi General Ki - Adi - Mundi ' s battle group to reach the nearby planet of Mygeeto , which — being a major holding of the Separatist - allied InterGalactic Banking Clan — was another target in the Republic ' s Outer Rim campaign . The world had been mired in conflict since 21 BBY , two years prior . While Mundi staged an assault on Mygeeto with his clone troopers from the 501st Legion and the Galactic Marines , Koon meanwhile assumed command of Republic forces on the Neimoidian purse world of Cato Neimoidia , a Trade Federation stronghold that was resisting Republic control despite its defeat a month earlier . Koon was later killed following Supreme Chancellor Palpatine ' s issuance of Order 66 , a secret for clone troopers to execute their Jedi commanders . Clone Captain Jag shot down the Jedi Master ' s Delta - 7 starfighter during an aerial patrol of one of Cato Neimoidia ' s bridge cities . Behind the scenes . The battle of the Ywllandr system was created for the of , which was authored by Matthew Stover and published on April 2 , 2005 . It was referred to in passing in the novel , not being alluded to in the film itself , which was released on May 19 of the same year . Several entries of the 2008 " The Complete Star Wars Encyclopedia " mentioned the battle , in particular expanding on how the Ywllandr system was a " choke point " for the Confederacy , which the novel had established but not elaborated upon . The battle was further referenced in " The Essential Atlas " ( August 2009 ) , which clarified that it was part of the Outer Rim Sieges ; and " The Essential Guide to Warfare " ( April 2012 ) , in which its connection to the Battle of Mygeeto was introduced .