How many movies have Heinz Paul and Käthe Haack collaborated on?

They have worked on 4 movies together! Their first movie together was Tannenberg (1932) while their highest rated movie together was Wunder des Fliegens: Der Film eines deutschen Fliegers (1935). They have not worked together since Wunder des Fliegens: Der Film eines deutschen Fliegers (1935). They are most known for their drama films together.