On the level where you have to kill the first fortress, (trust me you'll know it, it has traps on it and things that kill you when you get to close) you are suppossed to lose. You'll be told of a catapult the enemies have. go to that level, and obtain it, (when you get close enough to the catapult it will go to your side)(also the catapult is rather small) Use the Rain Juju repeatedly on this level, because there a set places where lightning strikes. Using Rain Juju stops the lightning for awhile. Also if the catapult starts smoking, don't let it take much more damage or it will
fall, and you will lose.