No battle plan may survive contact with the enemy, but not having a plan at all may create indecision such that you don't survive contact with the enemy either.
Check out the thread on the cop that survived getting shot three times, all in the vest, but one shot missed his head. He put distance between himself and the shooter because he was too far away to go for the shooter's gun that was already drawn on the cop. Even if you don't agree with the tactics, it is a great little story on survival and continued fighting to win...
http://thefiringline.com/forums/show...threadid=67997