At some point during the Clone Wars, CS-321 was captured by a band of Weequay pirates. Over 1 year into the war, CS-321 was present on the pirate ship Marauder watching a droid gladiatoral fight when two droids, R2-D2 and C-3PO, who had been captured on Balnab, were sent aboard the pirate ship. CS-321, R2-D2 and C-3PO observed the fight where the warrior K0-5D was competing against other droids. Artoo and Threepio were about to be sent into the ring when the Marauder was targeted by General Grievous and the Separatists for target practice. A laser blast ripped open the Marauder causing all aboard the to be sucked into space, the droids were captured by the Separatists and sent to be incinerated, CS-321 refused to be incinerated and was shot down by battle droids.