Answer: The black soldiers are saying they are fighting the people that they are suppose to be in war with but they are also fighting the white men are their team.
Explanation:
I said that because the last war in the us was in 1890 which back then racisms was still look as normal. The couple of black men in the war where sure to have people be rude to them by the color of their skin so it would make sense if the ''enemy within is a white man''.
(By the way I love your pfp!)
