Related Rule
New Zealand
Practice Relating to Rule 20. Advance Warning
New Zealand’s Military Manual (1992) states: “Effective advance warning shall be given of attacks which may affect the civilian population, unless circumstances do not permit.” 
New Zealand, Interim Law of Armed Conflict Manual, DM 112, New Zealand Defence Force, Headquarters, Directorate of Legal Services, Wellington, November 1992, § 518(1).