in the beginning of the game,they gave you these: 1. 3 devastator 2. 2 projectors 3.some missile tanks all you need to do is to seal off the small entrance with walls.the computer will now concentrate their attack on the bigger entrance.project 4-5 devastator and put them in the front line of your defense together with 5 missile tanks.build some assault tank to kill the leech spore(there will be a tleilaxu attack afterwards).assault tanks are very useful against leech spore,around 1-2 shots will kill the leech that is stick on your vehicle.keep your projectors alive and when you formed a strong economy background,try do upgrade your technology andbuid A lot of devastor and missile tank for your defense.it will be better to have some ADP in your base. OK-that is your defense now to the attack on the emperor worm.build three fremen camp and build 20 fremen fedys.group them into 5.(each group has 4 fedys).wait till the the enemy attack become weaker(there is about countdown time)sneak your fedys carefullyto the emperor worm.later,scatter them around the emperor worm and ATTACK.the emperor worm will die before the guild megacannon can strike.wait for your victory.(after that,your can have the worm as your dinner ;D ;D)