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Being lost is not a crime, although being drunk in public is. Niether of which constitutes the use of deadly force. I would do anything I could prior to their entry to avoid the termination of their life.

Take it up a notch, assume that they claimed to be the police.

Should you announce to the person that they have the wrong house and that you have a gun. Would the better option be to call 9-1-1 and wait at 90 deg. agle ready to fire if the door gives way?