There are very very few movies (feature or doc) about the Hurtgen Forest. The reason is that it was slotted between Market Garden and the Bulge, both of which were more dramatic and more decisive. It’s like the fighting the US Army did in New Guinea....tough, bloody and for the most part, ignored.
From what I have heard, that was one of the nastiest, bloodiest parts of the European war, and you are quite right to equate it with New Guinea...muddy, bloody, hopeless, as cold and nasty as New Guinea was wet, moldy and dank.