How many movies have Heinz Piper and Wolfgang Preiss acted in together?

They have worked on 1 movie together! Their first movie together was Der Fall Kapitän Behrens. Fremdenlegionäre an Bord (1966) and was their highest rated movie together. They have not worked together since Der Fall Kapitän Behrens. Fremdenlegionäre an Bord (1966).