We remember historian Stephen Ambrose who died Sunday at the age of 66. A college professor, Ambrose became a best-selling author late in life with his book D-Day, June 6, 1944: The Climactic Battle of World War II. He wrote several military history volumes including Citizen Soldiers. He was consultant for the film Saving Private Ryan and his book Band of Brothers was the basis of the 2001 HBO mini-series. Ambrose also wrote Undaunted Courage about the Lewis and Clark exploration to the West. This interview first aired Aug. 15, 2001.