Czerka 431, operated by the Czerka Corporation, functioned as a clandestine military research installation situated at the edge of charted space. In the course of the Jedi Civil War, the Sith Empire assumed command, compelling the scientist Joni Ree to conduct studies involving Juggernaut war droids. Displeased with her superiors, she established covert communication with the Galactic Republic, divulging the site's coordinates. She then planned an escape in conjunction with the Republic attack targeting Czerka 431.