In 3671 BBY, during the Great Galactic War, engineers under the employ of the Galactic Republic constructed a high-powered planetary shield on the Mid Rim world of Bothawui. This shield became the primary focus of the second Battle of Bothawui in that year, as the Sith Empire sought to destroy the shield generator so that it might bombard the planet from orbit.
Sources
Timeline 5: The Battle of Bothawui on The Old Republic's official website (article) (backup link) (First mentioned)- The Journal of Master Gnost-Dural