The 2015 wildfire season was the largest in Washington state history, with more than one million acres (400,000 ha; 1,600 sq mi) burning across the state from June to September. As many as 3,000 firefighters including 800 Washington National Guard members were deployed to fight the fires. The 17th Field Artillery Brigade of the United States Army also deployed 200 soldiers from Joint Base Lewis–McChord to help fight the fires. The Washington State Department of Natural Resources called the season the "worst-ever" in the state's history.