Conversation so far:
How was Jan Smuts involved in the second World War?
On 24 May 1941 Smuts was appointed a field marshal of the British Army.
Did Jan Smuts fight in WW2?
What was Jan Smuts most famous for?
Jan Smuts was the only person to sign both of the peace treaties ending the First and Second World wars.
Did Jan Smuts win the Nobel Peace Prize?
Jan Smuts was mentioned by Halvdan Koht among candidates that were qualified for the Nobel Prize in Peace. However, he did not explicitly nominate any of them.

Question: What was he nominated for?
Self-contained rewrite: What was Jan Smuts nominated for?