They called him "Homicide Hank," "Hammerin' Hank," "Hurricane Henry," "The Black Blitzkrieg," and "The Human Buzz-Saw," for he was the most ruthless destroyer of champions and challengers the sport has known. In all of boxing history, only one man has held the championships of three weight divisions at once: Henry Armstrong. This was in an era where there were only eight weight divisions. Still, there is more to his dazzling, unprecedented...