"...by 'soldiers", they of course mean slaves..."
WRONG!!
They were FREE men.
People who don't study history may find it remarkable that there were free blacks living in the South; but there were. Furthermore, some slaves were owned by "persons of color" (as the title documents record.)
BTW, only 12% of white southerners owned slaves.
Let's review what it said.
"Henderson was born in 1849 in Davidson County, NC. He was 11 years old when he entered service with the Confederate States of America as a cook and servant to Colonel William F. Henderson, a medical doctor."
Eleven years old, later took the same name as the person he served, can there be any doubt that in this case he was a slave?
Just out of curiosity how many free black men do you think served in the confederate army?