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The Louisiana Native Guards weren't allowed to fight in the Confederate Army because they weren't White. They were forced to disband. Also, I'm not sure if they were "Black" as understood at the time or were mostly mixed-race.

I thought this was interesting on the group's Wikipedia page:

Jamaican-born Lieutenant Morris W. Morris, who served as an officer in the Confederate Louisiana militia regiment and subsequently served for six weeks in the Union Native Guard regiment, was unique in that he was of Jewish ancestry, making him both the only black Jewish Confederate officer and the only black Jewish Union officer. He later became a famous actor as Lewis Morrison and his granddaughters, Joan, Constance and Barbara Bennett, were actresses whose black ancestry was never revealed.

Morton Downey, Jr. was Barbara Bennett's son.

Morton Downey, Jr. African-American?

[Bull Snipe]

The Native Guards contained many creole members. Many members were well to do free blacks in the parishes around New Orleans. Many were free black tradesmen, artificers, and craftsmen.