Second Battle of Fort Wagner
"The battle came one week after the First Battle of Fort Wagner. Although a Confederate victory, the valor of the Black Union soldiers in the battle was hailed, which had long-term strategic benefits in encouraging more African-Americans to enlist allowing the Union to employ a manpower resource that the Confederacy dared not emulate for most of the war." - https://en.wikipedia.org/wiki/Second_Battle_of_Fort_Wagner
