The most dangerous thing in the world is a second lieutenant with a map and a compass. There is no such thing as an atheist in a foxhole. A grenade with a seven second fuse will always burn down in four seconds. Remember, a retreating enemy is probably just falling back and regrouping. If at first you don't succeed call in an air-strike.
Exceptions prove the rule, and destroy the battle plan.
The enemy never takes notice until you make a mistake. One enemy soldier is never enough, but two is entirely too many. Whenever you have plenty of ammo, you never miss. Whenever you are low on ammo, you can't hit the broad side of a barn. The more a weapon costs, the farther you will have to send it away to be repaired.