Related Rule
Practice Relating to Rule 6. Civilians’ Loss of Protection from Attack
Section A. Direct participation in hostilities
The Report on the Practice of Zimbabwe states: “Civilians lose their protection if they actively assist or actively become engaged in military operations. This may include giving logistical and/or intelligence support. A lot, however, will depend on the degree of involvement.” 
Report on the Practice of Zimbabwe, 1998, Chapter 1.2.