Saw this many years ago.
Here’s what I remember about the film:
He’s the leader of a large band of bad guys.
Dressed all in black.
I don’t remember him having much dialogue, though I may be wrong on this.
In the end battle, there’s an enormous battle in (possibly) an abandoned fort with high walls.
I think a lot dynamite is used in the final battle.
Mitchell is almost a “horror type” in this film with the director paying a lot of attention to his face and costume. His character is “evil personified” without a trace of sympathy.