After getting divorced in the late 80s, I was living in a mobile home subdivision with about 100 other trailers. The neighbor across the street came over to use my phone to call the locals as her BF was getting a little rough again (he had been drinking). While talking to the dispatcher, he rattled my storm door so hard, the latch came apart and he came in past the inner door (ergo, he was at least 3' inside). I yelled into the phone, saying "He's here in my house and I'm pointing my gun at him ! Now get out here !!" At that time, the BF was ~4-5" taller and about 60 lbs heavier and, if he had taken one step closer, I would have shot him as I was "cornered" by the phone and couch.
Fortunately, he was not so drunk that he didn't see my gun pointed at him and he left.
The next day, he came back to apologize and help repair my storm door latch. He wasn't a "bad guy" but, living with his GF and her 3 kids was "stressful" and he drank too much.