The sport saw its beginnings during the early 20th century when warfare still incorporated the use of the cavalry horse, and the rigorous training for battle demanded absolute obedience on both the parade ground and in the field under fire. The advanced military machinery of World War I, however, quickly (and utterly) destroyed forever the use of the horse in modern warfare. Nonetheless, the cavalry training methods refused to die. Still sponsored by the Olympic committee, they gradually migrated their way out of the military agenda, to be warmly received by the civilian equestrian community.
The sport continues to be enjoyed on an international level, and is practiced by all levels - from novice to advanced, pony clubber to Olympian, from simple day events to the all-encompassing three-day. Some of the greatest and best known American (three day) Combined Training events are Radnor Hunt and Chesterland in Pennsylvania, Fair Hills in Maryland, Lexington in Kentucky, and Morven Park in Virginia.