Règle correspondante
Practice relating to Rule 66. Non-Hostile Contacts between the Parties to the Conflict
Section A. General
Nigeria’s Manual on the Laws of War states: “The conduct of war and the wish to restore peace sometimes require intercourse between the belligerents.” 
Nigeria, The Laws of War, by Lt. Col. L. Ode PSC, Nigerian Army, Lagos, undated, § 24.