The Raiders (1916)

While working as a clerk for stockbroker Jerrold Burns, Scott Wells overhears his boss' plan to ruin railroad magnate David Haldeman, but before Scott can warn David, the millionaire leaves town on vacation. Scott then decides that he himself will fight Jerrold on the floor of the stock exchange, and he goes to David's daughter Dorothy with his plan. She gives him all of her money, and Scott spends all of it in fighting off the first day's raid on David's financial empire. Then, Scott discovers that Jerrold's cronies hold David captive. Scott rescues the millionaire, and rushes him to the stock exchange, where David successfully defends his holdings against the takeover attempt. Afterward, Scott receives more than David's gratitude: he also gets his permission to propose to Dorothy, who quickly accepts.