The Confederate infantry prototype represented a battle droid design. This model was the brainchild of Gizor Dellso, a Separatist engineer in hiding who wouldn't give up following the Separatist defeat in the Clone Wars. Dellso, along with other Geonosians, intended to incorporate the prototype into a revived battle droid military force, with the goal of bringing back the Separatist Droid Army. Unfortunately for them, the Galactic Empire's 501st Legion obliterated both the prototype's blueprints and the secret manufacturing plant on the planet Mustafar where these droids were being manufactured during a period from 18 to 12 BBY years.
The Confederate infantry prototype's initial appearance was in Star Wars: Battlefront II, a Star Wars Legends game released in 2005 that combines first- and third-person shooter perspectives, and was created by Pandemic Studios and distributed by LucasArts.