- "Sir, there appears to be a disturbance in Hangar 9-4"
- ―A 501st Legion clone trooper to Jedi General Krell
Around 21 BBY, a battle took place on Umbara and this hangar was part of an airbase that was resupplying the Umbaran capital. Sometime during the battle the airbase was captured by the 501st Legion under the command of General Pong Krell and this hangar was used by ARC trooper Fives, Clone troopers Hardcase and Jesse for pilot training to destroy a Separatist Supply ship. This hangar was partially destroyed as a result of the flying lesson.