Related Rule
Practice Relating to Rule 33. Personnel and Objects Involved in a Peacekeeping Mission
Nigeria’s Military Manual (1994) states:
UN peace keeping Force should remain impartial, objective and neutral. Whenever it is perceived to be a party to a conflict, this does not exclude the applicability of International Humanitarian Law to UN Peace Keeping Force when it engages in defensive or combat mission in pursuance of their mandate. 
Nigeria, International Humanitarian Law (IHL), Directorate of Legal Services, Nigerian Army, 1994, p. 23, § 6.