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.
When the battle starts get on the high ground. If you see dynamite exploding near you then you're in the right place. Go to the edge and look for Hollister in the trench. When you see him throw dynamite at him until you run out or he moves. Watch out because when he moves he is usually going to the high ground where you are. When he gets on the high ground find him and go into quickdraw. Try and put as many bullets in his his head as possible before quickdraw runs out. When quickdraw does run out simply shoot him with your rifle. When the cutscene plays you're almost done. After it plays simply find Hollister on your radar. Then run to him and shoot him until he explodes.
Once you get 100% of all the side missions completed and story mode then a pop up will come saying that you have unlocked a noc gun. Then another will come and it says you have unlocked a black horse when you lose it it goes back to the mine.
How to take people hostage, and then how to execute them.
Added 2 Mar 2006, ID #5427
First, you hit them with your knife ( press the A button ) then you press the Y button and your guy will take them as a hostage. Now if you want to execute them, all you have to do is press the A button.
In the badlands acoss from Height farm you will see a old house. Go to back of house turn West and walk in mine an grab a barrel of TNT carry it out, back to house an place it by the chimney, near the left side and walk away an shoot it. Walk back and in the ground you will see the ammo dump. Good luck!!