On March 7, 1965, six hundred marchers led by John Lewis and Hosea Williams attempted to march from Selma to Montgomery, Alabama, to demand voting rights. At the Edmund Pettus Bridge, state troopers attacked them with clubs and tear gas in what became known as Bloody Sunday. The televised brutality shocked the nation, prompted President Lyndon Johnson to address Congress, and directly produced the Voting Rights Act of 1965. A successful march completed on March 25 under federal protection drew 25,000 people.