Established in July 1858 by a U.S. Army detachment under the command of Brevet Brig. Gen. Albert Sidney Johnston, Camp Floyd was named for then Secretary of War John B. Floyd. The detachment consisted of more than 3,500 military and civilian employees, including cavalry, artillery, infantry and support units. This unit, the largest single troop concentration then in the United States, was sent by President James Buchanan to stop a perceived Mormon rebellion, which came to be known as the Utah War.