Someone should tell these people. They don't make any reference to Hendson's Scouts being a BLACK MISSISSIPPI Confederate Unit...
You have to back that up with something.
Also, you may be thinking of Harvey's Scouts.
So far as I've been able to find out, neither Harvey's Scouts nor Henderson's Scouts was a "BLACK MISSISSIPPI Confederate Unit."
According to one webpage, the monument reads: "To the memory of the good and loyal servants who followed the fortunes of Harveys Scouts during the civil War ... A tribute to my Faithful Servant and Friend, Willis Howcott, a colored boy of rare Loyalty and Faithfulness, Whose Memory I Cherish with Deep Gratitude."