Règle correspondante
Practice Relating to Rule 155. Defence of Superior Orders
Luxembourg’s Law on the Punishment of Grave Breaches (1985) provides:
The fact that the accused has acted under the order of his Government or of a superior in rank does not relieve him of his responsibility if, under the circumstances at the time, he should have realized the criminal character of the order and had the possibility not to comply with it. 
Luxembourg, Law on the Punishment of Grave Breaches, 1985, Article 8.