Most of the time they aren't a real threat ot Ultuan at all. They just raid everyone else. When they are a "threat" to Ulthuan its almost always Melakith coming up with "one weird trick" to out flank them, and notice how He's Never Beaten Ulthuan.
Economies of scale also work in Naggaroth's favour there. Sparta was a tiny city state and even the Laceadaminon League (I know I'm spelling that wrong) was tiny. Like, ojectively tiny in both population and geography. Naggaroth is geographiclly huge and each individual city state is larger then all of the Laceadaminon and peloponisian Leagues put together. Scale means they can afford larger armies abroad without risking devistating revolt at home.
But swinging back around to the skill of the Druchii at war. Notice how each invation of Ulthuan is seperated by *literal millannia* and how they *still never win* or even come close to true political victory (the closest Melakith ever got was trying to blow up the vortex and take the whole world down with him, ignoring endtimes)? The Druchii, like the Spartans, *aren't* good at war. The best they manage to do is a roman or chinese frontier holding action against the chaos tribes to the north. Which involves as much trade, negotiation and outright alliences as it does military might.
All of the day to day threat they pose to the rest of the world is from their privateer fleets. Which are formed around literal floating islands better thought of as their own small traveling city states allied to Naggaroth then real military forces loyal to the witch king.
Edit: Thanks for sharing Carstein. I have read those blogs before (and agree with them based on my own study) and I'm pretty sure DP has as well based on his arguments but its good to see Bret getting more views!
