Sherman's scorched earth policies have always been highly controversial, and Sherman's memory has long been reviled by many Southerners. Slaves' opinions varied concerning the actions of Sherman and his army. Some who welcomed him as a liberator chose to follow his armies. Jacqueline Campbell has written, on the other hand, that some slaves looked upon the Union army's ransacking and invasive actions with disdain. They often felt betrayed, as they "suffered along with their owners, complicating their decision of whether to flee with or from Union troops." A Confederate officer estimated that 10,000 liberated slaves followed Sherman's army, and hundreds died of "hunger, disease, or exposure" along the way.

The March to the Sea was devastating to Georgia and the Confederacy. Sherman himself estimated that the campaign had inflicted $100 million (about $1.4 billion in 2010 dollars) in destruction, about one fifth of which "inured to our advantage" while the "remainder is simple waste and destruction." The Army wrecked 300 miles (480 km) of railroad and numerous bridges and miles of telegraph lines. It seized 5,000 horses, 4,000 mules, and 13,000 head of cattle. It confiscated 9.5 million pounds of corn and 10.5 million pounds of fodder, and destroyed uncounted cotton gins and mills. Military historians Herman Hattaway and Archer Jones cited the significant damage wrought to railroads and Southern logistics in the campaign and stated that "Sherman's raid succeeded in 'knocking the Confederate war effort to pieces'." David J. Eicher wrote that "Sherman had accomplished an amazing task. He had defied military principles by operating deep within enemy territory and without lines of supply or communication. He destroyed much of the South's potential and psychology to wage war."