The Battle of Asteroid 426 took place during the Clone Wars.
Arriving with the Separatist forces, General Sev'rance Tann was instructed by Dooku to fight through the asteroid field and Republic grid defenses to Asteroid 426, located outside of Sarapin in the planet's ring. It wasn't easy as the field was filled with Heavy Anti-Air turrets, which would destroy the fighters and the rest of the force very quickly. Fortunately with Confederacy cruisers, which were brought to assist Tann, she was able to slowly make way to the asteroid with facing a little resistance from the Republic fighters. Eventually making it to the asteroid, she ordered to destroy the supply depots, so she could get enough resources to set up a base on it. Meanwhile the Republic troops stationed on the asteroid led a periodic attacks to the enemy base, though it didn't faze them at all. Then, after gathering enough troops, she devastated the rest of the Republic forces and destroyed the power relay to Sarapin's shield.
Following the collapse of the planetary shield at the hands of the Confederacy, Sarapin was then left for the taking.
- Star Wars: Galactic Battlegrounds: Clone Campaigns (First appearance)