Life Long Mystery Soved - Its Petersen

"In the late 1970s while still a young boy growing up in Australia, I recall seeing a tiny part of what was either an American movie, Telemovie or even just a American TV show on the TV. What caught my attention was a scene in which a young women or teenage girl was having a party at her house to presumably celebrate her birthday. During proceedings a bunch of thugs crash the party and assault the young lady. One of the thugs said “SO THIS IS THE PARTY GIRL HUH ?” and then proceeded to rip the dress she was wearing. Just as things were getting hot an old man (possibly her father or grandfather) comes down stairs with a shotgun and threatened the thugs until they left. Unfortunately, not long after that my mother turned the TV off and I never ever saw anymore of it. I think the scene was probably too strong or explicit to have been in any U.S soap Opera at the time, so I can hopefully discount it from being in an old soap episode that will never be seen again. But for too many years now I’ve wondered what that TV show/Movie was. Does it at all sound familiar to anyone and do they know what this 1970’s show/movie it could have been?"

AT LONG LAST MY NEAR LIFE LONG MYSTERY HAS BEEN SOLVED. It's not American at all and yes, some other details were also slightly different to my distant childhood memory, but there's enough similarity to the events I described in the party scene to convince me that Petersen is the movie. HALLELUJAH I believe it's PETERSON (1974). I COULD ALMOST DIE A HAPPY MAN NOW.

For more detail on the saga of my years long search for the film or TV show that contained this scene, check out my discussion at https://moviechat.org/bd0000001/I-Need-To-Know/5fe3892e2c430103765b50d9/So-this-is-the-party-gir-huh?reply=641de6d7d169ed77a64bef2a

The party scene starts as about the 26 minute 15 second mark.
https://www.youtube.com/watch?v=rLEFr5gQaFc