After tracking Sun Fac to a hangar where he was attempting to escape, Sev sniped and shot down Sun Fac's starfighter, which killed him. Boss then went and reunited with his other squad mates and then attacked Sun Fac in his command center. Each member of Delta Squad boarded a separate LAAT/i gunship with Boss being commanded to destroy an armored bunker.
Boss and the Delta Squad would be given a mission to capture Poggle the Lesser's chief lieutenant, Sun Fac, on the planet of Geonosis. In 22 BBY, Delta Squad were deployed to Geonosis to fight in the Clone Wars' first battle. During a test of his melee skills, he broke his trainer's arm, and thus the trainer assigned him to the Delta Squad and gave him the title of sergeant, but his squad mates called him Boss. Boss trained on Kamino, but the difference with him was his high scores in weapons and tactics training.