U - Use All Your Senses, Undue Haste Makes Waste
You may make a wrong move when you react quickly without thinking or planning. That move may result in your capture or death. Don't move just for the sake of taking action.
Consider all aspects of your situation (size up your situation) before you make a decision and a move. If you act in haste, you may forget or lose some of your equipment. In your haste, you may also become disoriented so that you don't know which way to go. Plan your moves. Be ready to move out quickly without endangering yourself, especially if the enemy is near you. Use all your senses to evaluate the situation. Note sounds and smells. Be sensitive to temperature changes. Be observant.