A conflict unfolded circa 22 BBY on the world of Queel amidst the Clone Wars, pitting the forces of the Galactic Republic against those of the Confederacy of Independent Systems. Under the leadership of High Jedi General Obi-Wan Kenobi and Jedi General Anakin Skywalker, Republic troops endeavored to liberate Queel from the clutches of the Confederate Droid Army. Thanks, in part, to the actions of Skywalker's Padawan, Ahsoka Tano, the Republic succeeded in eliminating the Separatist artillery emplacement on Queel, thereby paving the way for an assault on the enemy command base. However, Skywalker and Tano were subsequently diverted from Queel to undertake a mission on the planet Mon Gazza, leaving Kenobi to carry on the fight.
Around 22 BBY, during the initial phases of the Clone Wars, the Galactic Republic faced difficulty in freeing the planet of Queel from the control of the Droid Army representing the Confederacy of Independent Systems. A Republic contingent of Infantry Support Platforms, commanded by High Jedi General Obi-Wan Kenobi and Jedi General Anakin Skywalker, engaged with several Confederate Single Trooper Aerial Platforms.
Concurrently, Ahsoka Tano, Skywalker's Padawan, was independently pursuing her own objective while riding a large native aquatic creature. Together with Clone Captain CT-7567, known as "Rex," and a number of other clone troopers, Tano launched an assault on the Separatist artillery position that was hindering the Republic's ability to directly attack the planet's droid command base. Rex utilized his two blaster pistols to eliminate multiple B1-Series battle droids operating one of the artillery pieces, while Tano employed her lightsaber to destroy both the gun itself and a DSD1 dwarf spider droid. Subsequently, Tano employed the Force to hurl one of the artillery shells at the remaining guns, and Rex detonated the shell with a blaster shot, resulting in the destruction of the entire artillery emplacement. With her mission accomplished, Tano rejoined Skywalker and Kenobi.
The destruction of the artillery battery paved the way for an assault on the Confederate command center. However, before any offensive action could be initiated, Skywalker and Kenobi were contacted by Clone Commander CC-2224, who relayed an urgent message originating from the Jedi Temple on Coruscant. The Jedi and Rex returned to their forward command post and received the transmission inside one of the HAVw A6 Juggernauts. Jedi Masters Yoda and Ki-Adi-Mundi informed them that a Separatist agent had absconded with a data file containing information of critical importance to the Republic, intending to deliver it to the Confederacy on the planet Mon Gazza. Consequently, Yoda and Mundi directed Skywalker to proceed to Mon Gazza and retrieve the data file. Shortly thereafter, Skywalker, Tano, Rex, and Skywalker's astromech droid, R2-D2, departed for Mon Gazza, leaving Kenobi to continue the battle on Queel.
The battle of Queel was initially featured in the graphic novel The Clone Wars: Crash Course, authored by Henry Gilroy and Gary Scheppke, with illustrations by Fillbach Brothers, and published by Dark Horse Comics on December 31, 2008.