Anyone can use reasonable force to remove a trespasser from thier home, and anyone can use reasonable force to in self defence if they have an honestly held belief that they, or someone else, is in fear of imminent violence. There is no precise legal definition of what is reasonable and each case will be considered in light of its particular circumstances ...
There was a case like that in 2010 in germany
tl;dr synopsis of the German article:
The police raided the private home of an alleged member of a criminal gang. This was performed as a no-knock raid. The police officers did not announce themselves as such when they started to break open the door.
The suspect had reason to believe that a rival gang was ...
Has there ever been a successful defense based on "self-defense" in a case of a person charged with killing an on-duty police officer?
Detective Constable John Fordham was on duty when he was killed by Kenneth Noye, a career criminal, who was found not guilty of his murder by successfully claiming self-defence.
John was ...