A friend of mine is currently working in an archive in South Carolina and came across a reference to the Crater from a soldier who served in the 18th South Carolina Infantry:
The Negro troops were slaughtered without mercy, we not allowing them to surrender, they huddled together in the pit formed by the explosion and our men deliberately capped down on them and beat out their brains and bayoneted them until worn out with exhaustion. We took the other prisoners, a number however were shot or hung after brought to the rear- this may seem cruel and heartless to those at home but let them come to VA and see the sights we have seen and they will no longer say so. Kill, kill every negro soldier is my motto.
I have files and files of Confederate accounts that reflect this mindset, but what I find so interesting about this particular account is the explicit reference to the home front. It is tempting to speculate as to the “sights” that this particular soldier is referring to, but it seems reasonable to suggest that it was specifically the presence of black men with guns that so impressed him. It must have been a challenge for soldiers to depict the sight of large numbers of black men with guns to loved ones back home, especially in South Carolina.