is Robert Duvall's voice dubbed in this?

First off let me say I love this movie and it has been one of my favorites. I watched it the other night on my big screen, and I do have to agree with others that Robert Duvall's accent is really distracting at times.

Don't get me wrong--Duvall is an outstanding actor who has had a distinguished movie career. But I do feel that he was not right for this role. They definitely should have used someone who was English.

Patrick Macnee, who played Watson in "Sherlock Holmes in New York" is one that comes to mind.

I actually quite enjoyed Duvall’s performance, but he is shockingly miscast. It’s his own voice but the accent is entirely unconvincing.