Detective Comics (1937) #370
"The Nemesis from Batman's Boyhood!" is written and drawn by Bob Kane. There's no criminal who can long escape the two-fisted justice meted out by the Caped Crusader Batman. Gotham City's protector uses his hand to hand combat skills liberally when battling crooks who dare break the law in his town. But when it comes to the Blitzkrieg Bandit, a smash and grab thief who moves quickly from city to city, Batman finds he just can't raise a fist, not even to save his own life!
To get to the bottom of this mystery, Bruce Wayne has to delve deep into his past as a schoolboy when a bully named Bart Lambert made his life a living hell. The bigger Bart took great pleasure in throwing the smaller young Bruce around and the experience emotionally scarred the man who became the Batman. Somehow, the World's Greatest Detective needs to overcome his childhood trauma! Then, artist Gil Kane and writer Gardner Fox bring you the Elongated Man in the "Case of the Colorless Cash!"