You can ensure the success of your attacks if you only attack places that are undefended. You can ensure the safety of your defense if you only hold positions that cannot be attacked. Therefore, that general is skillful in attack whose opponent does not know what to defend; and he is skillful in defense whose opponent does not know what to attack.
Sun TzuIf you fight with all your might, there is a chance of life; where as death is certain if you cling to your corner
Sun TzuMaking no mistakes is what establishes the certainty of victory, for it means conquering an enemy that is already defeated.
Sun Tzu