tom swift among the diamond makers

 Sun Tzu says in his book if you travel over fifty li with or army only one-tenth will make it if you travel thirty li with your army only two-thirds will make it and baggage will be lost. He also says to deliberate and think before you move. When you do move, move quickly and attack without warning. Make your plans as dark as the night. If you cannot understand or use the terrain to your benefit you will be lost. Use the locals as guides so you may know the best way to attack.