After the rogue Sith Lord Darth Maul escaped from the Spire prison on Stygeon Prime, General Grievous was stationed aboard a Separatist dreadnought with the super tactical droid Tey-Zuka. The cyborg general and tactical droid took the dreadnought to the planet Zanbar, where the Confederacy attacked a Shadow Collective rendezvousing there with Maul. During the battle, Tey-Zuka remained on the ship, in which both Confederacy and Collective sustained heavy casualties. Grievous launched his forces towards the surface, and Maul's troops immediately began firing anti-aircraft weaponry at them. Maul used the chaos to his advantage by escaping onto one of the fighters, before ordering his surviving forces to retreat. The Separatists suffered heavy losses, losing most of their droids in the battle.
Grievous and Tey-Zuka prepared their own strategy while making their way to the planet Ord Mantell. The Separatists deployed their droid forces on the surface, where they are met in battle by the limited but powerful number of Shadow Collective troops. When the battle began, the Shadow Collective forces engaged the battle droid army on the surface, while Maul made his way into orbit and boarded Grievous' command ship where Tey-Zuka was stationed. Maul struck down Tey-Zuka and the rest of the droids on the bridge before capturing Grievous.