A conflict occurred circa 21 BBY on the world of Ereesus. The opposing sides were the Ereesus Planetary Security Forces against both the Galactic Republic and the Separatists. A squad under the command of Sergeant Palola was taken prisoner. In response, CT-7567 spearheaded a rescue mission based on covert communications, a form of secret signals known solely to Lorrdians. The clone troopers successfully liberated the captured squad and also acquired the head of the tactical droid's.
The Ereesus engagement is depicted in the story Speaking Silently, penned by Jason Fry. It was published in January 2013 within the pages of Star Wars Insider 139.