The conflict known as the Battle of Ord Mantell, which is also referred to as the Battle on Ord Mantell, took place during the Clone Wars. It involved Maul's Shadow Collective and the Confederacy of Independent Systems both on and above the planet Ord Mantell. This battle was the brainchild of Maul and Mother Talzin, who believed the Sith and Separatists were attempting to expose and eliminate Talzin. The purpose of the battle was to ensnare Count Dooku and General Grievous by drawing them into a carefully laid trap on Ord Mantell.
Maul, along with allies from the Shadow Collective such as Death Watch, the Black Sun, and the Pyke Syndicate, orchestrated the trap. Just prior to the arrival of the Separatist forces, a group of Nightbrothers under the leadership of Viscus arrived via a transport sent by Talzin as reinforcements. As the battle commenced, the Shadow Collective forces clashed with the battle droid army on the planet's surface. Simultaneously, Maul ascended into orbit and boarded the command ship. Grievous, faced with the choice of death, deactivated the battle droid army at Maul's command, leading to the cyborg general's capture. Dooku, having defeated the Nightbrothers, was also captured by the Shadow Collective forces.
Once the battle concluded, Maul communicated with Talzin, who informed him that their revenge against the Sith was imminent, with the capture of Darth Sidious soon to follow.