Rules of a Gunfight
Avoid them like the plague
Be aware of what is going on around you by staying in condition yellow.
Have a plan or two. (If not, a "Last Will & Testament will do.)
Corollary: No plan survives contact with the enemy.
Bring at least one gun (don't bring a knife).
Bring the biggest gun you can handle.
Bring friends (as friendly witnesses or fire support).*
Let close air support or artillery soften-up the target for you.
Make use of available cover.
Remember the difference between concealment and cover.
Don't get shot (Use cover to your advantage).
Place your shots well.
Pay attention to where your shots fall.
"Speed's fine, but accuracy is final."
Don't miss. (You can't miss fast enough to win.)
Never assume your opponent is out of ammo.
Bring lots of ammo.
In combat, you will be scared. You will have a tendency to shoot high. Be aware of this and aim low.
As a group of soldiers stood in formation at an Army Base, the Drill Sergeant said, "All right! All you idiots fall out."
As the rest of the squad wandered away, one soldier remained at attention.
The Drill Instructor walked over until he was eye-to-eye with him, and then raised a single eyebrow. The soldier smiled and said, "Sure was a lot of 'em, huh, sir?"