The beginning of the 20th century saw rapid changes to the understanding of the fine arts and the First World War was a big catalyst for all the new art movements of Modernity like Cubism, Expressionism or Impressionism. Countless painters like Otto Dix or Max Beckmann used their paintings to process the horrors they had lived through. Before this war, paintings used to glorify soldiers and generals, but the new schools of art couldn't be further from that and so it is no wonder that the Nazis displayed a lot of World War 1 paintings in their exhibition of degenerate art ("Entartete Kunst") before World War 2.
