Adolf Hitler made many hundreds of directives, orders and decrees while Führer of Nazi Germany, many of them related to military policy, and the treatment of civilians in occupied countries. Many of them are direct evidence of the commission of war crimes such as the notorious Commando Order. Other orders provide evidence of crimes against humanity, such as the Hitler order establishing forced euthanasia of disabled people in 1939 under Action T4, and the Nacht und Nebel order for eliminating civilian resisters in occupied countries.