See the following website for some recent research on this: http://people.virginia.edu/~jh3v/retouchinghistory/essay.html An excerpt: Retouching History: The Modern Falsification of a Civil War Photograph Jerome S. Handler and Michael L. Tuite, Jr. [1] Introduction “In the past decade,” the Yale historian David Blight has recently written, “the neo-Confederate fringe of Civil War enthusiasm . . . has contended that thousands of African Americans, slave and free, willingly joined the Confederate war effort as soldiers and fought for their ‘homeland’ . . . . Slaves’ fidelity to their masters’ cause - - a falsehood constructed to support claims that the war was not about slavery - - has long formed one of the staple arguments in Lost Cause ideology.” [2] In this paper we discuss a graphic example of Blight’s contention by examining a Civil War-era posed studio photograph of black Union soldiers with a white officer. We maintain that this photograph has been deliberately falsified in recent years by an unknown person/s sympathetic to the Confederacy. This falsified or fabricated photo, purporting to be of the 1st Louisiana Native Guards (Confederate), has been taken to promote Neo-Confederate views, to accuse Union propagandists of duplicity, and to show that black soldiers were involved in the armed defense of the Confederacy. . . . .