Braddock (with George Washington as one of his aides) led about 1,500 army troops and provincial militia on an expedition in June 1755 to take Fort Duquesne. The expedition was a disaster. It was attacked by French and Indian soldiers ambushing them from up in trees and behind logs. Braddock called for a retreat. He was killed. Approximately 1,000 British soldiers were killed or injured. The remaining 500 British troops, led by George Washington, retreated to Virginia. Two future opponents in the American Revolutionary War, Washington and Thomas Gage, played key roles in organizing the retreat.