How was Fridtjof Nansen awarded the Nobel Prize Peace?

Name: Fridtjof Nansen.
Country: Norway.
Date of Birth: 10 October 1861.
Died: 13 May 1930.
Education: Royal Frederick University.
Subjects Of Study: Inuit.
Known as: Dead Water, Nansen Bottle, Nansen Ice Sheet, Nansen Passport, Nansen’s Fram expedition, Oceanography, and Polar meteorology.
Noble Prize Year: Nobel Prize for Peace in 1922, for his leading role in the repatriation of prisoners of war, in international relief work and as the League of Nations’ High Commissioner for refugees.