Henry Jackson Jr. was an American professional boxer and a world boxing champion who fought under the name Henry Armstrong. He is regarded as one of the greatest fighters of all time by many boxing critics and fellow professionals.

Armstrong started out as a professional on July 28, 1931, being knocked out by Al Iovino in three rounds. Just like Alexis Argüello, Bernard Hopkins and Wilfredo Vazquez in the future, Armstrong was one world champion who started off on the losing end.