T690 was dispatched in the early morning hours to give mutual aid for a house fire in Clarke County. While en route, RE 602 was also dispatched to the same location in order to assist companies from Mt. Weather, Clarke County, Warren County, Loudoun County, Frederick City and Charlestown W. VA. The truck crew worked on ventilation upon arrival to the incident. Crews from the Rescue Engine worked to clear out and extinguish the remaining fire in the house. Crews from several stations worked 5+ hours to extinguish the fire.