I don't suppose there is anything unique about Sgt. White's fate, but this is a sad and callous recollection.
The February 1864, Battle of Olustee in Florida comes pretty close to black-flag affair, at least in regards to the Georgia state troops in their treatment of the USCT's:
HEADQUARTERS DISTRICT OF FLORIDA,
Jacksonville, Fla., September 25, 1864.
Major General E. A. HITCHCOCK,
Commissioner for Exchange of Prisoners:
GENERAL: Soon after the battle of Olustee, in Florida, a list of wounded and prisoners in the hands of the enemy was forwarded to our lines by the commander of the rebel army. The very small number of colored prisoners attracted immediate attention, as it was well known that the number left wounded on the field was large.
It is now known that the most of the wounded colored men were murdered on the field. These outrages were perpetrated, so far as I can ascertain, by the Georgia regulars and the Georgia volunteers in Colquitt's brigade.
As many of these troops are now in our hands as prisoners, an investigation of circumstances might easily be made. All accounts represent the Florida troops as not engaged in the murders.
Very respectfully, your obedient servant,
JNO P. HATCH,
Brigadier-General, Commanding.
O.R. Series 2, Volume VII, part I, pg. 876
"In passing over the field, and the road ran centering through it, my attention was first attracted to the bodies of the yankees, invariably stripped, shoes first and clothing next. Their white bodies looked ghastly enough, but I particularly notice that firing seemed to be going on in every direction, until the reports sounded almost frequent enough to resemble the work of skirmishers.
A young officer was standing in the road in front of me and I asked him, 'What is the meaning of all this firing I hear going on.' His reply to me was, 'Shooting nlggers Sir. I have tried to make the boys desist but I can't control them.' I made some answer in effect that it seemed horrible to kill the wounded devils, and he again answered, 'That's so Sir, but one young fellow over yonder told me the nlggers killed his brother after being wounded, at Fort Billow, and he was twenty three years old, that he had already killed nineteen and needed only four more to make the matter even, so I told him to go ahead and finish the job'. I rode on but the firing continued.
The next morning I had occasion to go over the battle field again quite early, before the burial squads began their work, when the results of the shooting of the previous night became quite apparent. Negroes, and plenty of them, whom I had seen lying all over the field wounded, and as far as I could see, many of them moving around from place to place, now without a motion, all were dead. If a negro had a shot in the shin another was sure to be in the head."
William Frederick Penniman , 4th Georgia Cavalry