I've been trying to locate a movie for almost 30 years. I posted about this several years ago on the SciFi BB and got some good suggestions, but while they turned out to be good, none were what I'm looking for. Since there are so many different people here now, including some who seem to be movie experts, I thought I'd try again.
If, by any chance, you recognize it, PLEASE don't reveal what happens, EVEN AS A SPOILER ALERT!!
It's a war movie. I imagine one of the World Wars and probably II, but I really don't know about any of that. I think it was black and white.
I call it a 2-person movie. Perhaps there were scenes with other people at the beginning and end. Perhaps they even cut away from the main part to show other things happening during the movie, but all I recall is the one man and one woman and their encounter.
They are from opposites sides of the war. I believe they already knew each other and perhaps had already been involved. They have to take refuge in a cabin (because of a storm or something) and spend the night there together.
It keeps going back and forth. At one moment the woman is holding the gun on the man and saying she'll turn him over to her side in the morning. Then, they get all "lovey-dovey" again and one thinks they'll just go together and no one will turn anyone in. Then, it reverses and he's holding the gun on her, etc.
Aside from all the suspense (and I have no idea which way it came out), it also played with the viewer's emotions, so that at one point you want the person from "our" side to prevail and then you want them just to get together, etc. That's why I don't want even a spoiler indication of what happens!!
Anyhow, any time I've seen a listing for a war movie or anything that sounds like it could be it, I've watched it. I've yet to find it. During most of 1972 I was living in New York and I saw it on late night television there. A couple of times I started checking out the New York Times on microfilm at the library to check the movie listings for those months to see if I could locate it, but never got very far.