You should put them on resources(that look like towns and stuff) so it costs money if and enemy occupies the fort.
If you stuck all resources under towns, you could use merchants like governors that you dispatch or something to govern the countryside. :) I'm not sure if they get auto-ejected if an enemy occupies your fort though... Then there's always the sniping that can occur between those guys so I guess its not such a great idea for merchants = governors.
Bookmarks