This clip from the 1970 documentary, "King: A Filmed Record... Montgomery to Memphis," shows scenes from the three historic marches from Selma to the capital Montgomery. The first took place March 7, 1965, and became known as "Bloody Sunday" after police attacked 600 marchers with billy clubs and tear gas. The second march came the following Tuesday, attracting more than 2,500 protesters, who were forced to turn around by police after crossing the Edmund Pettus Bridge. We hear from Dr. King as he successfully crosses the bridge along with thousands of others on the third march, under the watch of federal troops mobilized by President Johnson. Finally, we will hear Dr. King's address in the capital of Montgomery, where the march triumphantly ends.