Sarrish

"Sarrish? Sarrish. Wait. What was the Battle of Sarrish?"

-Clone Commando CT-5576-39 (Commander Gregor)

Sarrish was an outer rim planet that hosted The Battle of Sarrish. The Galactic Republic lost the battle so the planet fell into Separatists hands. Sarrish was mentioned briefly in season 5, episode 12 of the clone wars animated series and has not been mentioned since.