Rugle refers to a trio of BFF-1 bulk freighters utilized by the Galactic Empire throughout the Galactic Civil War. While being guarded by a pair of Assault Gunboats, they were confronted by the Rebel Nebulon-B Frigate Dodger. Even though the Rebel Frigate had more fighters, the Gunboats successfully defended the freighters, allowing them to jump to Hyperspace.
Subsequently, this engagement was documented and replicated within the Combat chamber. This served as a training exercise for TIE pilots, including Maarek Stele.