WI, in the aftermath of the Fort Pillow massacre in April 1864, USCT soldiers had retaliated on a much larger scale against captured Confederates ? OTL, "Remember Fort Pillow" became a rallying cry for both white & black Union soldiers, with such instances of retaliatory violence as an iowa regt summarily executing 5 out of 10 captured Confederates, plus another instance of USCT soldiers, at 1 captured coastal fort in Alabama, shooting captured Confederates, but WI such reprisals by black soldiers thruout every theatre of war had been on a much wider & more systematic scale- say, if the Crater assault by the 4th Union div of USCts had been successful, with the black regts leading the charge as they'd been assigned, then deciding not to take prisoners, perhaps reversing the OTL massacre they sustained from the Confederates who had them trapped within the Crater ? Would the war have become even bloodier on both sides, with the Confederates engaging in more brutal counter-reprisals, or OTOH, would the CSA have, in light of being shown by their opposite numbers that mistreatment of black soldiers wouldn't be tolerated, been compelled to become more humane in their policy towards blacks in uniform ?