When the United States entered World War II in 1941, Hemingway served as a correspondent and was present at several of the war's key moments, including the D-Day landing. Toward the end of the war, Hemingway met another war correspondent, Mary Welsh, whom he would later marry after divorcing Martha Gellhorn.
In 1951, Hemingway wrote The Old Man and the Sea, which would become perhaps his most famous book, finally winning him the Pulitzer Prize he had long been denied.