A clash unfolded on the planet of Kolaador during the Galactic Civil War between the forces of the Galactic Empire and the Alliance to Restore the Republic. This world served as the location of an Alliance Pilot Training Center established by 0 BBY, where the notable pilot Rookie One received training and subsequently participated in the planet's defense.
Situated within the Kolaador system of the Outer Rim Territories, the planet of Kolaador presented a rugged landscape characterized by numerous canyons adorned with crystalline spires. Before 0 BBY, the Alliance to Restore the Republic founded a Pilot Training Center there, utilizing the intricate canyon network to provide challenging training exercises for their pilots. Rookie One was among the individuals who underwent training at this facility.
During the period of the Galactic Civil War, Kolaador faced an assault by the Galactic Empire, with an attacking force spearheaded by three Star Destroyers. The Empire deployed TIE fighters and TIE Interceptors from orbit, engaging Rebel forces in intense dogfights amidst the planet's crystal canyons. The Rebel forces included A-wing and X-wing starfighters. Rookie One, a graduate of the Kolaador training facility, was present among the Rebel defenders, piloting an X-wing.
The inspiration for this battle comes from the box art featured on Star Wars: Rebel Assault, a video game created by LucasArts and launched in 1993. This artwork was later repurposed for the Rebel Assault: The Official Insider's Guide. Created by Greg Winters, the artwork portrayed a battle on Kolaador, an event that did not actually occur within the game itself; Kolaador was only used as a training ground, devoid of any combat. Later, Topps reused this artwork in their 1995 Topps Star Wars Galaxy Series 3 set of trading cards, which were released in 1995. The description on the back of the card confirmed Rookie One's participation and solidified the battle's place within the Legends continuity. However, the exact chronological placement of this battle remains unspecified, except for the fact that it must have taken place after Rookie One completed their training there.
The Excerpts from the Journal of a Rebel Pilot mention Rookie One revisiting the same bar at Kolaador Rebel base three years after the destruction of Anchorhead Base. This visit could potentially be connected to the aforementioned battle, placing it around the year 3 ABY.