The pivotal event in the Arrakis Revolt, the battle is fought between Paul Atreides's Fremen and the Padishah Emperor Shaddam IV's Imperial Sardaukar. Muad'Dib's forces routed the Saudakar and the Emperor negotiated with Paul Atreides. During the negotiations, Feyd-Rautha Harkonnen, at this time the Baron of House Harkonnen, challenged Muad'Dib to kanly. Muad'Dib killed him and after his death, sealed an agreement that gave him control of the known universe.