On the afternoon of June 26‚ 1990 the Perryville Inmate Crew was working to secure a dozer line on the Dude Fire on the Tonto National Forest near the Bonita Creek Subdivision. High temperatures‚ low humidity‚ dry fuels and strong down bursts from local thunderstorms caused extreme fire behavior and escape routes were compromised. The Perryville Crew was overrun and 11 crew members deployed shelters. Zig Zag Hotshot Superintendent Paul Gleason had come back up the canyon after evacuating the area the warn the crew‚ found several members burned and called for medical assistance. The events of that day led him to develop LCES‚ which is now a core principal in Firefighter safety and tactics. It was also after this fire that Dick Rothermel coined the term Plume Dominated Fire Behavior. The lessons learned from this fire have had a profound impact on the study of wildland fires and firefighter safety.