How do Hemingway's war works reflect his feelings?

Looking at the changes of Hemingway's war theme creation, he experienced the process from confusion and emptiness to brave struggle. In For Whom the Bell Tolls, Hemingway also transcends the direct imitation of war and shows a kind of courage to fight and die for justice. Hemingway's concern about war, a form of confrontation, reflects his concern about violence and death in life. This kind of external armed confrontation is a test of human courage and dignity, which Hemingway discovered in his life.