Chancellorsville, Brice’s Crossroads.
Both of which were extraordinarily risky maneuvers. The difference is that the southern generals knew their own men, what they were capable of, and also understood the minds of their opponents.
If the Union had had better generals, or better scouting, both battles would have been a disaster for the CSA.
If you divide your force in the face of a superior enemy and win, you are bold. Do the same thing and lose, you’re reckless. Them’s the breaks.
Custer had been bold in many battles and got away with it. This time it turned out he was reckless.