Chances are, if you've looked into the Civil War period likely seen "The Scourged Back" or some version of it as the image is quite famous. As the report above points out:

Harper's Weekly originally published the photo on Independence Day in 1863, in the immediate aftermath of the Battle of Gettysburg. At the time, it chronicled Gordon's escape from a Louisiana plantation before he took up arms for the Union during the Civil War, the Portrait Gallery website explains.
One journalist after seeing the image said, "This Card Photograph should be multiplied by 100,000 and scattered over the States. It tells the story in a way that even Mrs. [Harriet Beecher] Stowe cannot approach, because it tells the story to the eye," according to the Smithsonian museum.