During the Imperial Era, the Imperial ship Transport 904 crash-landed on the planet, and its cargo, a cloned Zillo Beast specimen, escaped. The rogue clone troopers of Clone Force 99, unaware of the ship's cargo, arrived on Silla and attempted to scavenge it, but discovered the creature and eventually fled. The citizens of a nearby village would be rounded up and whisked away as the beast went on a rampage.