From Wookieepedia, the Star Wars wiki.
This battle on an unidentified planet was a battle that took place between the Galactic Republic and the Confederacy of Independent Systems during the Clone Wars.
Behind the scenes
It is unknown how this battle began or progressed. Many clone troopers are seen surrendering to B2 super battle droids and many OG-9 homing spider droids, so it was a Separatist victory.