Additional information about this movie can be found here.
Civil Warriors
Searching for Black Confederates: The Civil War’s Most Persistent Myth
“Levin’s study is the first of its kind to blueprint and then debunk the mythology of enslaved African Americans who allegedly served voluntarily in behalf of the Confederacy.”–Journal of Southern History
I’m not clear on when it has, or might yet, hit PBS. It sounds fascinating. Do you have more information?
At this point nothing more than what is included on the website.