This movie is heavily character progression dependent. And what this movie can't do? Developing characters!
We have got a story in the World War I. An ethnically mixed group has a secret mission to find an Italian communication camp where they use pigeons.
The movie can't find it's tone. They are mixing it all over the place. With the ever changing music themes and camera shakes and stills.
The dialog is awful you can't feel any connection to any of the characters. Even the young protagonist is empty. Making the ending of the movie meaningless with some awfully edited scenes.
The movie can't follow the rule of "show, don't tell. They have to tell us every little moment every little action that is happening as we can't see it for ourselves this movie does not have faith in its viewer.
The movie feels like some old folk got drunk after a midnight party and got lost in the woods believing its the World War I too bad we can't believe it too...
TL. DR.: Awful Dialog, Bad Characterisation, Don't waste your time with this movie!