A base belonging to the Separatist faction was constructed on the planet of Aargonar. This occurred during the Clone Wars conflict, which pitted them against the Galactic Republic. The Confederacy military contained an officer who was the husband of Senator Mina Bonteri; he played a role in setting up the base. When Republic clone troopers launched an attack on Aargonar, targeting the base, Bonteri's husband suffered death.
The initial reference to the Separatist base on Aargonar can be found in "Heroes on Both Sides," which is the tenth episode from third season of the animated television show Star Wars: The Clone Wars. Its original broadcast date was November 19, 2010.