Following the commencement of the Clone Wars by a duration of five months, a specific undertaking, the Omphalos mission, was initiated.
This particular mission was a clandestine endeavor, with General Mace Windu in overall command.
The primary aim, upon arrival via a LAAT/i gunship, was to prevent the completion of a weapon under development for Count Dooku. This weapon was designated 'the Planet Killer'. Regrettably, the LAAT/i was downed, resulting in the demise of all the clones under Windu's command. After giving them a proper burial, he continued the mission.
Windu, drawing upon skills most likely acquired during his time as a Jedi Padawan, pressed forward to fulfill the mission's objectives. Upon arriving at a bridge, the Jedi Master encountered the initial presence of Confederacy of Independent Systems droids. He engaged and overcame a substantial number of these droids, ultimately prevailing.
Upon his arrival at the 'Planet Killer', Windu engaged in combat, defeating a pair of B2 super battle droids, and effectively neutralized the weapon by destroying the detonator mechanism.
Due to the Planet Killer's operational failure, Count Dooku expedited the development timeline for a superweapon of his own.