He had spent time over the years immersing himself in his breakout roles of both Butch Cassidy and mountain man Jeremiah “Liver-Eating” Johnson. Robert Redford as The Sundance Kid, left, and Paul Newman as Butch Cassidy in the 1969 movie "Butch Cassidy and the Sundance Kid." (Getty Images)Following The Outlaw TrailA decade after this scouting trip to Thermopolis, Redford accepted National Geographic's challenge of following the Outlaw Trail with enthusiasm. “I had read a film script that told of at least 100 people shot in the war,” Redford wrote. She took hold of Redford’s arm and looked him straight on, leaving him with words that he carried with him long after the trek down The Outlaw Trail had ended.