The most important war strategy

http://en.wikipedia.org/wiki/The_33_Strategies_of_War

10) Create a Threatening Presence: Deterrence Strategies.[1] Make people think they will lose, bluff if needed. People want an easy victory and will not attack if they think they will lose.
Reverse Intimidation. 1) Make bold maneuvers and bluff wisely, 2) be a threat, make sudden moves, imply aggression, 3) move irrationally, create unpredictability, act crazy, 4) Feed your opponent's paranoia by indicating capabilities that they are afraid of, 5) maintain a bad reputation, mean, nasty and non-negotiable.