"Confederate Soldiers Marching 1863 - Authentic American Civil War Footage."
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UPDATE
I hope I have to eat my words above, because now upon research it looks like this could be authentic. I had never heard of anything but the still picture of the ANV on the way to Gettysburg. When I originally saw this, I thought it was an early 20th century Confederate Memorial Day Parade, perhaps.
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"Authentic American Civil War footage shot by French experimental photographer and inventor Léon-Alexandre Cànular (1810 - 1896) using a single lens camera that he had devised. It is one of the earliest examples of motion picture and the first with war as the subject matter. Shot at 16-18 frames per second, only photographic copies of parts of the paper filmstrip exist today.
The subject matter is thought to be The Army of Northern Virginia advancing thought Maryland prior to the Battle of Gettysburg. This footage was preserved by the National Film Registry in 1991 for being ''a historically significant film.''
