This is Herzog's first movie, and yet it seems of a piece with his later work. The tone, seemingly mundane locations, the music, the incidental characters, the non-actors, the threat and menace of a disturbed mind - its all in here.
Not his best work - I didn't like the sudden flipped switch into apparent madness, especially after the languid first hour in the company of the three soldiers, and there was very little character exploration of the wife and their relationship. and it should have been in colour. I think the bleak bright setting would have benefitted from it. However, Herzog tells how he does whatever it takes to make his films, and I am just glad he made it at all.