wishiwazsmart

In the Harkonan Campaign you have to choose which brother to go with when the father dies. I wanna go with the blonde skinny one but I can't beat the level where I have to kill the fat brother. It is a pain in the butt. Could someone please tell me how to beat it or atleast tell me what the cheat code is for skipping the level or invinuble units or something. I am getting to the pissed point where it isn't even fun anymore. Thanks.