Rumor heard from an old friend. Take it for what it's worth...

[canetoad]

29. Nope

In 1945–46, during the Nuremberg trials the issue of superior orders again arose. Before the end of World War II, the Allies suspected such a defense might be employed and issued the London Charter of the International Military Tribunal (IMT), which explicitly stated that following an unlawful order is not a valid defense against charges of war crimes.

Thus, under Nuremberg Principle IV, "defense of superior orders" is not a defense for war crimes, although it might be a mitigating factor that could influence a sentencing authority to lessen the penalty. Nuremberg Principle IV states:

The fact that a person acted pursuant to order of his Government or of a superior does not relieve him from responsibility under international law, provided a moral choice was in fact possible to him.

https://en.wikipedia.org/wiki/Superior_orders

This was claimed by numerous Nuremberg defendants, Hoess, Eichmann and others. They were all executed.