Cassian Jeron Andor was born on Fest 10 years before the Clone Wars. When Cassian was 10, his family decided to move to Roxus Secundus to support the newly formed Confederacy of Independent Systems, but their ship was attacked by the Galactic Republic during the voyage and crashed on a nearby planet. The planet where Cassian fell, Kennari, was controlled by the Confederacy of Independent Systems, and it was there that Cassian was adopted by a pro-Confederacy family and adopted the surname Andor. Together with his new father, Cassian joined General Kalani's unit in the Battle of Aargonar and achieved great success. Although he served in General Kalani's unit at the Andor Battle of Duro after the Battle of Aargonar, he witnessed General Grievous being very cruel and ruthless to both his own unit and the enemy troops during the battle. After the end of the war, General Grievous ordered Andor to kill innocent people, but Andor defied this order and fell out with Grievous. After the end of the war, General Grievous ordered Andor to kill innocent people, but Andor defied this order and fell out with Grievous. During the Battle of Geonosis, he saw the losses suffered by both sides and wanted the war to end as soon as possible, so he resigned from military service.