Соответствующая норма
Practice Relating to Rule 20. Advance Warning
Croatia’s Commanders’ Manual (1992) states: “When the mission permits, appropriate warning shall be given to civilian populations endangered by the direction of attack or by their proximity to military objectives.” 
Croatia, Basic Rules of the Law of Armed Conflicts – Commanders’ Manual, Republic of Croatia, Ministry of Defence, 1992, § 54; see also § 67.