The Battle of Corellia was a large-scale conflict that occurred on the planet Corellia during the Galactic War between the Sith Empire and the Galactic Republic. As the peace brought by the Treaty of Coruscant collapsed into open war, the Sith Lord Darth Decimus led an invasion force to the prestigious Core World, sparking a lengthy fight for control. Darth Decimus' invasion force descended on the planet after months of planning and forming of alliances with the Corellian Council, who declared Corellia's allegiance to the Empire as the Imperials arrived in the skies. However, pockets of civilian resistance soon began to spring up, organized by the Corellian Security Force and the native Green Jedi, and the Empire quickly discovered that the Corellians would not accept Imperial rule so easily.