Related Rule
Practice Relating to Rule 100. Fair Trial Guarantees
Section B. Trial by an independent, impartial and regularly constituted court
Croatia’s Instructions on Basic Rules of IHL (1993) states that judicial independence and impartiality are essential guarantees that may not be suspended even in situations of armed conflict. 
Croatia, Instructions Basic Rules of International Humanitarian Law Applicable in Armed Conflicts, Republic of Croatia, Ministry of Defence, 1993, Instruction No. 4.