Erase the memory of the last war. The last war you fought is a danger, even if you won it. It is fresh in your mind. If you were victorious, you will tend to repeat the strategies you just used, for success makes us lazy and complacent; if you lost, you may be skittish and indecisive. Do not think about the last war; you do not have the distance or the detachment. Instead do whatever you can to blot it from your mind.
