Is this the movie in question?
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It does does sound interesting and will look for it and have no trepidation whatsoever. Have heard first hand accounts of people that have lived through WW2 through family members and in-laws spanning from my native Netherlands to my current SO's family that is Japanese. The things they have had to endure and see and do is beyond comprehensive.
It is this one. And it's a masterpiece of horror, loss, psychological torment and anger. Starts kinda slow the first hour, but then the hard and gritty parts really get going, and it only grows worse the more you watch, until when it's over you're left wondering how you can so thoroughly love something that you simultaneously abhor.
Again, don't watch if you are squeamish about cruelty. I've got really high tolerance for that stuff, the first ''Saw'' movie left me unfazed for reference, and even then the movie got to me and I had to struggle inwardly to finish it because it was so stark, so real, so heavy, like trying to eat a 7-pound chocolate cake on your own in one sitting kind of heavy. For a few days afterwards I could still vividly see some scenes of the movie whenever I closed my eyes, like I was experiencing some type of very minor PTSD induced by simply sitting on my couch and watching that flick. Yeah, I know what you're thinking, but to my defense Klimov brews some really serious nightmare fuel here, of the indelible kind.
By the way, off-subject but an important mention, all bullets and explosions you see in the movie, except those directly shot at actors, are live ammunition. There are a few scenes where the actors could literally die, with mortars, molotovs, mines, grenades, and other such dangerous contraptions going off right in front and to the sides of them for real, no special effects used. If you see trees getting mowed down by bombs raining down, stuff exploding or burning, branches falling off because of bullets being fired, well, it's not CGI, they really are being destroyed, blown to smithereens and everything in-between.
Of course, Klimov uses perspective, elevation and other such techniques when filming to make it seem like the danger is closer to the characters than it really is, but still, pretty wild. In fact, I'm pretty sure it wouldn't have been able to be shot in America as insurance companies would have bailed at the simple mention of ''shooting live ammunition'', before even hearing about detonating pre-planted bombs close behind the actors in a forest while they ran towards the camera with little protection.
Anyways, go see it if you wish, it definitely deserves some respect and admiration as a work of art, but remember what I said about heaviness. Also remember Nietzsche's infamous saying about abysses and what it does to you if you stare too long.
After the viewing, if you indeed choose to watch it, your first instinct will be to want to never watch it again, maybe even expunge it from your memory, but then another part of you will wonder about the details that you might have missed the first time, will exclaim at the wondrous historical rigor and lengths to which Klimov went, the absolutely terrific acting, and kind of want to watch it again. Whether you do or not will depend on you, but I personally watched it a second time and the heaviness was still there albeit different in shape and structure as you can really concentrate on comprehending all the different nuances and details. I had more fun watching it the second time so I guess it's something of an acquired taste.