Related Rule
Practice Relating to Rule 87. Humane Treatment
Section B. Civilians
Germany’s Military Manual (1992) provides that civilians not benefiting from the protection of the 1949 Geneva Conventions and their 1977 Additional Protocols shall be treated humanely. 
Germany, Humanitarian Law in Armed Conflicts – Manual, DSK VV207320067, edited by The Federal Ministry of Defence of the Federal Republic of Germany, VR II 3, August 1992, English translation of ZDv 15/2, Humanitäres Völkerrecht in bewaffneten Konflikten – Handbuch, August 1992, § 518.