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All Settlements Walled for DeI 1.3

This submod adds invisible walls to all minor settlements, so the AI has to besiege them. This submod does not change anything about major settlements, which already have walls. When fighting on the battle map, the game loads a city with walls.
Warning: The game does not have models for walled minor port settlements, so it will crash if you try to fight one of those on the battle map. They have to be autoresolved. Although barbarian ones seem to work.
This submod was made with the DeI 1.3 public beta buildings, so it requires Divide et Impera below it in the load order. But it is modularized, meaning it only adds an effect to some buildings and leaves all other effects untouched, so it will likely continue to work unless the DeI team removes entire buildings in a future update. It probably also works with previous DeI versions such as the current stable 1.2.8, but i have not tested that. Just make sure you load this on top of any mods using building_effects_junction_tables.