Since by definition slaves don't have a choice, perhaps they fought because they were told to?
A great many societies have used slave soldiers, with some major empires, such as the Mameluke and Ottoman, having been based on the institution for centuries.
"Weary Clyburn was best friends with his master’s son, Frank. When Frank left the plantation to fight in the Civil War, Clyburn followed him."
"He fought alongside Frank and even saved his life on two occasions."
Typical yankee response. You guys have one version of antebellum South and that is of beatings, rape, inhumane labor, lynchings, etc.
It just doesn't fit your narrow minded views that blacks and whites were actually getting along just fine.
Answer this; once Weary was on the front lines, why didn't he run over to the yankees to be 'saved' from the terrible bondage and beatings that he must have been getting on a daily basis?