The amount of population that is added is equal to the population cost of training such a unit, so a company would add 6 population if I'm not mistaken. It is actually a potential exploit --I think-- when playing as the Undead since training an undead unit does not cost you population. Disbanding such a unit however, still adds population to a city.
Thanks! I tried your suggestion yesterday and I got the level-up dialog the next turn as you said. I can't confirm if there are any other situations when the game "forgets" this dialog, but I'll post it here if I find anything.
1. Get the population of a city close enough to its next level population threshold. 2. Disband an army, such that the army population is added to target city. Within the same turn, repeat until target city reaches or crosses the population threshold. 3. Instead of getting the city level up bonus selection dialog, only the level up sound effect plays. It appears that the bonus improvement is lost forever? I've had the same thing happen with Magnar or the Dead DLC faction
I encountered the following problems with the Deorcnysse wildland on the wildlands DLC map: There is no way to finish the quest (conquering the city has no effect) Wildland influence doesn't disappear The city lacks a strong garrison The city level starts at level 30 The last point is interesting, as the city level is apparently a factor in the faction power rating calculation and thus affects diplomatic relations. I don'