my strategy works but it costs alot of both time and money. i destroyed one of the houses and captured the guild cannon and the barracks group that are in the middle of the map. i then built alot of ordos mortar infantry and atreides kindjal and snipers. i then had the mortar and kindjal attack the emperor worm while the sniprs defend them. i also sent over sardaukar and fremen warriors to help. if yo have mortar infantry, devasators, elite sardaukar, fedakin and ADP's attacking all at once then the worm doesnt stand a chance