The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 8: Soldier Life and Secret Service.
Francis Trevelyan Miller, Ed.

Preparations for the march to the sea—Atlanta, 1864

The soldiers sprawling on the freight-cars are one of the bodies of troops that Sherman was shifting—changing garrisons, and establishing guards, in preparation for his famous march to the sea. Below appears a wagon-train leaving Atlanta; but comparatively few wagons accompanied the troops on this movement. Everything possible was discarded and sent back over Sherman's strong line of communications. The soldier's personal effects were generally limited to his blanket, a pair of socks, and a piece of shelter-tent, although many discarded even the latter. Nothing was transported but ammunition, absolutely necessary commissary supplies, and grain for the animals. All invalids and those incapacitated for hard marching were sent back, and the average company was less than thirty men.

Preparations for the march to the sea—Atlanta, 1864

One of Sherman's wagon-trains