Second Battle of Rhen Var The Second Battle of Rhen Var was an early conflict during the Clone Wars . Although still a minor planet in terms of overall strategic importance to the Republic , Rhen Var held the ruins of the temple which held the tomb of fallen Jedi Ulic Qel - Droma and contained information that was vital to the destruction of the Dark Reaper . The Battle . After the Confederacy of Independent Systems ' overwhelming victory that had secured their hold of Rhen Var in the days prior , Jedi Knight and General , Obi - Wan Kenobi and his Padawan , Anakin Skywalker launched an assault to retake the planet . During the landing , an " Acclamator " - class assault ship carrying the experimental AT - XT walkers was shot down , crashing in a wide , snow - covered canyon that quickly came under attack from Separatist forces determined to ensure nothing could be salvaged . Kenobi and Skywalker gathered their forces and moved with haste toward the crash site in " Saber " - class fighter tanks , joining up with the already operational AT - XTs in defending the downed transport , buying time for the surviving walkers to mobilize and escape the wreckage . When the area around the transport was secure , Skywalker took command of a squadron of the bipedal walkers from the cockpit of an AT - XT himself and moved on the enemy ' s fueling station . The walkers were equipped with powerful mortar cannons and after several volleys , the depot was destroyed and the Separatist ' s refueling capabilities crippled . Having already dealt a serious blow to the Confederacy ' s ability to fight , Skywalker then took to the sky in an LAAT / i gunship , destroying a heavy gun turret laden outpost that was holding down a substantial number of the assault ' s clone forces ― both infantry and several armored AT - TE walkers ― with suppressive fire , along with supplying the main Separatist army with further reinforcements . He would also pursue two Vehicle Armored Carrier s through a narrow canyon while they were en route to drop more Separatist automata on the battlefield ; Skywalker destroyed them both before either could unload its cargo . Kenobi then tasked his Padawan with aiding a squadron of Delta - 7 starfighters rid the Separatist command center of the numerous gun turrets that were preventing LAAT / i gunships from landing troops . Once Skywalker and the other pilots had eliminated the command center ' s anti - aircraft capabilities , Kenobi deployed a squadron of gunships to land at the center . Once on the ground , clone troopers rapidly disembarked from the gunships ' crew bays and stormed the battlefield . The planet ' s military citadel ― which could be accessed through a land harbor nearby ― was the site of a CIS sensor station . Skywalker ordered an AT - TE to penetrate the harbor . The Separatists tried to defend their walls with battle droids and four Armored Assault Tanks , but the gun turrets that were built onto the barracks were quickly destroyed and clone troopers soon poured into the harbor from all sides , including a side tunnel hollowed out within a network of several icy caverns . The sensor station soon fell to the Republic . Meanwhile , Skywalker moved on , leaving the command center and citadel in the capable hands of the clone trooper . As he approached the temple , weaving through a high - walled canyon of ice , he discovered a massive convoy of Separatist vessels consisting of numerous large Multi - Utility Transport s with AATs moving at their flanks . Kenobi warned that should the convoy reach the Jedi monument , the Republic army would be vastly outnumber and so Skywalker quickly engaged the convoy , battling them from the air until every last tank was destroyed . Their threat removed , Skywalker joined up with the main bulk of the Grand Army ' s ground forces at the monument , finding a " Lucrehulk " - class Core Ship and three " Hardcell " - class transports . Skywalker destroyed the " Hardcell " transports while , at Kenobi ' s order , two squadrons of LAAT / c gunships swooped down to deploy two armored AT - TE platoons as defensive support for twin SPHA - T artillery walkers assaulting the Core Ship . Once the Core Ship was brought down under concentrated fire , Skywalker landed the gunship , and proceeded to enter the Jedi Monument in a fighter tank . Before he could proceed any further , he had to defeat the Spectral Guardian s protecting Ulic ' s tomb . After defeating the guardians , Skywalker reached the ancient tomb of Ulic Qel - Droma within , where he alone learned how to withstand the effects of the Dark Reaper . With his new knowledge , Anakin declared the battle over and departed from the planet , leaving the CIS in defeat .