Execute Battalion was a battalion of clone troopers belonging to the 501st Legion, a component of the Galactic Republic's military. This battalion participated in the Clone Wars as one of three brigades. During the Battle of Devaron, Clone Captain Rex instructed Execute Battalion soldiers to operate the AT-TE known as ATAT300 for the purpose of boarding a Munificent-class star frigate from the Separatist forces, which was under the command of Cad Bane, a bounty hunter.
A clone trooper battalion called Execute Battalion was a part of the 501st Legion, specifically within one of its three brigades. Being a battalion within the Grand Army of the Republic, it consisted of four companies, each containing 144 troopers, resulting in a total of 576 troopers in the battalion.
After Cad Bane, a bounty hunter, raided the Jedi Grand Temple and obtained a holocron, he traveled to Devaron with the intention of capturing Bolla Ropal, a Jedi General who safeguarded the kyber memory crystal required to unlock the holocron. While Separatist Alliance forces, led by Bane, attacked the Galactic Republic outpost and seized Ropal, the Fifth Fleet's Venator-class Star Destroyer Resolute, commanded by Fleet Admiral Wullf Yularen and Jedi General Anakin Skywalker, engaged Bane's fleet of five Munificent-class star frigates, destroying four of them before they could escape.
When the Star Destroyer disabled Bane's frigate, preventing its jump to hyperspace, Execute Battalion was aboard the Resolute. Clone Captain Rex gathered troops from three 501st brigades, including troopers from Execute and Carnivore Battalions, in preparation for boarding the frigate. Due to a lack of boarding craft, General Skywalker instructed Admiral Yularen to activate three All Terrain Tactical Enforcer walkers to serve as boarding vehicles. Despite Yularen's reservations about using them for boarding, Captain Rex and Skywalker's Padawan Ahsoka Tano concurred, leading Rex to order Execute Battalion members to board walker ATAT300, Carnivore Battalion to board walker 773, and the remaining troops to follow him to the third walker.
The three walkers were deployed from the Resolute's hangar, which had positioned itself above the Separatist frigate. These walkers landed on the frigate's hull and used their magnetic mechanical feet to remain attached. They opened fire on B1-series battle droids stationed on the hull's exterior and attacked the frigate's emplacements, but one of the walkers was destroyed by Vulture-class starfighter droids. The remaining two walkers advanced towards the aft of the frigate, continuing to engage Separatist forces. With Skywalker and Tano securing an airlock, the surviving clone troopers disembarked from their walkers and entered the frigate.
The remaining Republic forces proceeded to the frigate's bridge, but failed to capture Bane, who escaped just before they breached the area. The Separatist command crew also erased the ship's memory banks, eliminated evidence of their mission, transferred ship functions to Bane's wrist comm, and initiated the ship's self-destruct sequence.