Relations deteriorated between Mormon leaders in Utah Territory and federal authorities in Washington, D.C. Following the election of President James Buchanan, the United States Army was ordered to Utah to install a new governor, replacing Brigham Young, as well as to establish a military presence. As the army advanced, the Mormons in the Green River valley withdrew, burning Fort Supply and Supply City. On the night of October 7, 1857, "Wild Bill" Hickman set fire to Fort Bridger to keep it from falling into the hands of the approaching United States Army during the Utah War.