During the era of the Galactic Civil War, the Galactic Empire launched an assault against the world of Kostra. In the midst of this battle, Alliance aviator Fulkrehm Protial crash-landed his Y-wing, suffering near-lethal exposure to trosilon nerve toxin. Meanwhile, on the Tantive IV, Princess Leia Organa made a clandestine trip to the planet in order to bolster the Rebel efforts. She relayed communications, distributed vital supplies, and provided the Rebels with crucial time to escape.