Later during the war, Deviss took part in the battle of Altyr V. During the battle, Deviss' Jedi General was killed by enemy fire, leaving Deviss to improvise a new plan of attack. Deviss rallied the remaining clone trooper companies before destroying a Separatist ion cannon emplacement, opening the battlefield to aerial bombardment and winning the battle for the Republic. For this act of bravery and initiative, Clone CommanderCC-5052, nicknamed "Bly," promoted Deviss to the rank of commander. His promotion allowed Deviss to wear the redARC pauldron and a kama, as well as a special macrobinocular helmet attachment.[2] In 19 BBY, Deviss served in the raid of the Separatist-controlled Colonies world Cato Neimoidia,[3] which ended with a Republic victory.[4]
As the war neared its end, Deviss was dispatched to the planet Orto in order to support Jedi KnightNem Bees in the upcoming battle. Bees managed to gain access to a HoloNet transceiver, with which he established contact with the Republic forces, and Deviss was ordered to arrive with his battalion of clone soldiers in-system at a designated time. Bees disabled the shield generator of the planet just as the Republic strike force emerged from hyperspace. Deviss rendezvoused with Bees as the Republic forces landed, and together they began the task of removing the entrenched droid armies. After a week of fighting, Order 66—an order for all clone troopers to execute their Jedi officers—was issued. While Bees led an attack on the enemy lines, Deviss carried out the order, shooting and killing the Jedi Knight.[5]
Deviss survived many battles during the Clone Wars and was a capable leader. Even after his Jedi General was killed on Altyr V, he managed to rally his troops and win the battle for the Republic. The commander also showed his bravery when he defended wounded comrades on Geonosis by himself, receiving a medal for his actions.[2] Deviss was loyal to the Supreme ChancellorPalpatine and the Republic, as he gunned down his commanding Jedi General during Order 66.[5] His red-striped Phase II clone armor featured a kama, polarized macrobinoculars, and a pauldron. His quick-release holster held two DC-17 hand blasters. Deviss was also known to carry a DC-15A blaster rifle.[6]
Deviss was originally intended to be Clone Commander Bly, who appeared in George Lucas' 2005 film Star Wars Episode III: Revenge of the Sith. However, due to the environment Bly appeared in during the film, his armor was changed to the color yellow. The unused "red Bly" would then become Deviss.[7] Despite not being in Revenge of the Sith, however, Deviss appeared as an unnamed clone in the Revenge of the Sith: The Visual Dictionary.[6]