On second thought...I'm willing to bet money that nobody will guess this film.
It's an obscure British movie called Went the Day Well. If it's remembered at all today, it's because its story of German paratroopers invading England in disguise inspired The Eagle Has Landed. I use it in my War & Society in 20th-Century Britain class, along with Mrs Miniver, which is why it popped into my head.
So, here: this one should be much easier.
It's true that I'm not very knowledgeable about old Hollywood movies and about horror films. I've always been more interested in European films. Besides, my favourite genres/eras are neorealismo and German silent movies, which is why I immediately thought of the shoot-out scene towards the end of Dr. Mabuse, der Spieler when I saw Goliath's fist pic and then was disappointed it had the wrong people in it.
