Sit by the river long enough, and you will see the body
of your enemy float by.
A. Provided you have planned ahead well. B. Because eventually you start to hallucinate. C. If your enemy is also sitting by the river,
make sure you are downstream.
clue:
I have seen the saying attributed to Sun Tzu and to Genghis Khan.
That means it is probably by no one you’ve heard of.