Shot, dying boy asking “why am I thirsty?”

A young man was shot an the torso during what I think was civil or colonial war time judging by the medicine. An older man I assume the main character takes him to the medical tent where they’re turned away because there are too many other injured men. The boy is asking for water then says “I’m thirsty, why am I so thirsty?” The mc takes lays him down and tries to soothe the boy asking if he believes in God and telling him that God loves him too. The boy then dies.
I saw the scene a while ago and want to know what movie its from.