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It’s difficult to fight golems with only vampires, because you can’t eat them, just like you can’t eat gargoyles. The main counter to vampires are gremlins; if you’re fighting a Fortress, eat and attack with stronger units. You can use skeletons as fodder so that the vampires don’t get killed. Since the Fortress has many archers, you can do this: block the titans with dragons (maybe they’ll even get old and this movie will be great!), dreadknights, and gremlins, because the latter won’t do much to them. Then, use vampires to attack the mages (vampires are practically immortal in a duel; even if there are twice as many mages, the vampires will win due to their numbers).