Alarm Bell/Militia

I think it would be cool to have an alarm bell. When someone enters your territory and begins committing crimes, the alarm bell would sound. The owner of the bell would recruit "militia," who are allied players who will be notified with a message in System Chat that their ally's claim is being attacked. When the militia come to defend the bell-owner's claim, the owner would be messaged with the militia members' names and how much damage they dealt. The owner of the alarm bell could even set rewards for successful militia members so as to attract the most powerful fighters to his or her claim. Not only would this add another incentive for building up a network of allies (and allow the possibility for some truly delicious backstabbery), but it would also be handy for players like me, who want to defend their claim but spend much of their time offline.
What do you guys think?
Forgive me if there's already a mechanic like this, I'm a somewhat inexperienced player!
What do you guys think?
Forgive me if there's already a mechanic like this, I'm a somewhat inexperienced player!