"The Atreides house is building a secret army, using a technique unknown to us; a technique involving sound. The Duke is becoming more popular in the Landsraad; he could threaten me. I have ordered House Atreides to occupy Arrakis, to mine the spice, thus replacing their enemies, the Harkonnens. House Atreides will not refuse because of the tremendous power they think they will gain. Then, at an appointed time, Baron Harkonnen will return to Arrakis and launch a sneak attack on House Atreides. I have promised the Baron five legions of my Sardukar terror-troops."