When you start the fight Dutchie will be on a train cannon. Immediatly run backwards and up the hill. Make sure you're on horse back. Right before you reach the rocks blocking the path turn right there will be a ledge with a large rock on it. Get on the rock make sure you're on horseback or this won't work. When you get on the rock take out any type of rifle or sharpshooter and start shooting Dutchie in the head. If done correctly he shouldn't shoot at you and he should die quickly.
Added by: martial arts mas.. Apr 26th 2006, ID#5777