Riwwel, an Admiral in the Imperial Navy, served in the early years of the Galactic Empire. His assignment involved commanding the Imperial forces sent to suppress the rebellion on Acherin, a planet located in the Outer Rim. The conflict between the Empire and the resistance fighters lasted for almost a year, but ultimately, the Empire's superior strength led to the resistance's defeat. Toma, the leader of the resistance, declared their surrender. However, Riwwel, believing the surrender insufficient compensation for the Imperial casualties, commanded the total destruction of the resistance by bombing their headquarters, the historic city of Eluthan.