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The Third Military District of the U.S. Army was a temporary administrative unit of the U.S. War Department that existed in the American South. The district was stipulated by the Reconstruction Acts during the Reconstruction period following the American Civil War. It comprised Georgia, Florida and Alabama and was headquartered in Atlanta.
The district was originally commanded by General John Pope until his removal by President Andrew Johnson on December 28, 1867, when General George Gordon Meade took his place. Meade served at the current location of Fort McPherson until August 1868 after Alabama and Florida were re-admitted into the United States.
Because of the expulsion of Blacks from the Georgia legislature, a new military leader was appointed on December 22, 1869, General Alfred Terry. In January, he returned the legislators and ousted 29 Democrats. In February, the Fifteenth amendment was ratified by Georgia and by July it was re-admitted into the Union.