by Anduin
I really cannot find a rule for something like "home realm folks".Your home realm has 3 areas. One of those areas has a fortress by default. The other two areas are empty (but still count as friendly). If no units are in your home realm. The only area where a battle occurs is the area with the fortress in it. But this is not different to any other area.
I don't get your problems. If someone moves units in one area of your home realm when there is no defensive units or a fortress. With whom do you want to fight out this battle?