Battle of Ruusan
this struggle took place roughly 1,000 years before the Battle of Yavin, during the latter stages of the New Sith Wars. It was a prime example of the Old Republic's ability to pacify a recalcitrant group which disregarded the Republic's authority. In a series of seven titantic battles, the Jedi Knights - led by Lord Hoth and the Army of Light - defeated Lord Kaan and the Brotherhood of Darkness five times. The Sith forces were decimated, and Lord Kaan and his followers created a thought bomb as a last-ditch effort to destroy the Jedi. In the resulting explosion, every single warrior on Ruusan was obliterated except one. That lone survivor was the Sith Lord, Darth Bane.