The Fourth Military District of the U.S. Army was one of five temporary administrative units of the U.S. War Department that existed in the American South.
At various times, the district was commanded by generals Edward Ord, Alvan Cullem Gillem, and Adelbert Ames.
Johnson, a loyal Tennesseean, advocated a lenient strategy to remove all commercial and social restrictions between the states, with the intention for the South to return to its former position in the Union.
He believed that former Confederates should receive amnesty for their actions during the war and regain full rights of citizenship.
Edward Ord served as the district's first commander, with Alvan C. Gillem, like Johnson a loyal Tennessean, in charge of the sub-district of Mississippi.