I hesitate to tell you this....I saw a documentary on Ted Turner's Gods and Generals in which Duvall made some disparaging remarks about the saint he was portraying.
Not trying to discredit Duvall, just setting the record straight.
Really, I didn't know that... Too bad since I always understood that Lee was one of his favorite historical figures...so much so that he actually took the initiative in contacting Maxwell and asking for the role when word got out that 'Gods and Generals' would be made. Maxwell had originally wanted Duvall to play Lee in 'Gettysburg,' but he was unavailable at the time, much to Duvall's chagrin.