As much as I know Emperor has more or less the same scheme for victory. On the last (or one of the last - I can't remember now) you have to defeat the Sardaukar and kill the Imperial Worm (which is a huge, mutated worm.) The thing why I prefer WarCraft3 to Emperor is that in WC3 the campaigns follow each other in a line and unlike in WW games the aim is not always the destroying-everything-that-moves idea, but achieving a goal, which is suitable for your race. I think buying sards is good, because they are good at slaying infantry units very fast. Too bad they weren't made uncrushable by tanks such as tesla troops in Red Alert. The thumper infantry is used to deter the worms from your base and from your harvesters. Place one to a distant part of the map, if you want to neutralize the sandworms, but if you want to use them as an attacking unit do the following: deploy a thumper infantry close to the enemy base. After a few minutes/seconds a worm will arrive, and it will go for your thumper. Now undeploy the thumper and re-deploy it closer to the enemy base. Keep on doing this until you run into enemy, base-defending vehicles. They will kill your thumper, and by doing this they will have the worm attacking THEM, because it has no thumper to follow. ;)