Of particular concern to the Nazi scientist Eugen Fischer were the "Rhineland Bastards": mixed-race offspring of Senegalese soldiers who had been stationed in the Rhineland as part of the French army of occupation. He believed that these people should be sterilized in order to protect the racial purity of the German population. At least 400 mixed-race children were forcibly sterilized in the Rhineland by 1938. This order only applied in the Rhineland. Other African Germans were unaffected. Despite this policy, there was never any systematic attempt to eliminate the black population in Germany, though some blacks were used in medical experiments, and others mysteriously disappeared.