During WWII, a Belarusian boy is thrust into the atrocities of war, fighting with a hopelessly unequipped Soviet resistance movement against ruthless German forces. Witnessing scenes of abject terror and surviving horrifying situations, he loses his innocence and then his mind.
https://www.imdb.com/title/tt0091251/

very good film even if its from a soviet Point of View.
[youtube https://www.youtube.com/watch?v=feT-gLVsOR0&w=560&h=315]
[youtube https://www.youtube.com/watch?v=rvT8SD5gu3A&w=560&h=315]