" 'If we ain't fighting to keep slavery, then what the hell are we fighting for?' Following the failure to turn the hard-won victory at Chickamauga into a decisive one, he concluded that both the Confederacy and slavery were doomed, and accordingly he freed the forty-five slaves who were serving him as teamsters."
Unfortunately he does not source these statements.
Of interest would be what civilian [slave] Teamsters were paid versus Privates at $11 a month serving the same duty. My copy of Confederate Army Regulations doesn't provide the answer.