However, I didn't really like the education system on the Fortress, as there aren't any interesting skills in it, and the additional stats often go into knowledge, while there's already too much mana. In the campaign, there are a lot of stat boosts, so 30-40 attack and defense at the end is guaranteed.
As for logistics, I haven't quite figured it out. I didn't take the slow-moving Fortress, and it slowly reached the enemy and generally explored the map, but it was extremely strong and left no chance for the enemy, even if it attacked a four-month-old army with a two-month-old army. But the small movement range was annoying when going around stat boosts.