Related Rule
Luxembourg
Practice Relating to Rule 153. Command Responsibility for Failure to Prevent, Punish or Report War Crimes
Luxembourg’s Law on the Repression of War Crimes (1947) provides:
Without prejudice to the provisions of Articles 66 and 67 of the Penal Code, the following may be charged, according to the circumstances, as co-authors or as accomplices in the crimes and offences set out in Article 1 of the present law [i.e. war crimes]: superiors in rank who have tolerated the criminal activities of their subordinates, and those who, without being superiors in rank of the principal authors, have aided those crimes or offences. 
Luxembourg, Law on the Repression of War Crimes, 1947, Article 3.
Luxembourg’s Law on the Punishment of Grave Breaches (1985) provides:
Without prejudice to the provisions of Articles 66 and 67 of the Penal Code, the following may be charged, according to the circumstances, as co-authors or as accomplices in the crimes set out in Articles 1 and 3 of the present law [i.e. grave breaches of the 1949 Geneva Conventions and acts related thereto]: superiors in rank who have tolerated the criminal activities of their subordinates, and those who, without being superiors in rank of the principal authors, have aided those crimes. 
Luxembourg, Law on the Punishment of Grave Breaches, 1985, Article 5.
The Law further provides for the punishment of persons
who, having knowledge of orders given with regard to the commission of crimes set out in Articles 1 and 3 [i.e. grave breaches of the 1949 Geneva Conventions and acts related thereto] or of facts being at the beginning of the commission thereof, and who could have prevented the completion or could have terminated it, did not act within their scope of action. 
Luxembourg, Law on the Punishment of Grave Breaches, 1985, Article 6.