Chiss Legion

The Chiss Legion was a volunteer unit serving the Confederacy of Independent Systems during the Clone Wars. Founded by General Sev'rance Tann, a CIS officer and one of Count Dooku's Dark Acolytes, the Legion was made up of volunteers from the Chiss Expeditionary Force who were loyal to Tann. Though she was killed a few months after the Battle of Geonosis in 22 BBY, the Legion continued serving the Separatists, and many became officers of great tactical ability, as noted by the CIS high command.

It numbered to 5,500 troops at it's peak, and was split into two battalions. Most already had training, but were given additional instruction in combat by commando battle droids and Separatist mercenaries. During the war, the Chiss Legion usually was used for auxiliary duties, such as acting as a rear guard or guarding important bases. It often was given oversight over units of other volunteer legions, such as the Human Legion and Geonosian Legion. After the war ended, the Chiss Legionnaires went into hiding across the galaxy, knowing that the Galactic Empire would be looking for former Separatists and that their government would not accept them back.