With Europe in the midst of World War II, Sherwood set aside his anti-war stance to support the fight against the Third Reich. "There Shall Be No Night", his 1940 play about the Soviet Union's invasion of Finland, was produced by the Playwright's Company that he co-founded, and it starred Alfred Lunt, Lynn Fontanne, and Montgomery Clift. Katharine Cornell produced and starred in a 1957 TV adaptation on TV. Sherwood publicly ridiculed isolationist Charles Lindbergh as a "Nazi with a Nazi's Olympian contempt for all democratic processes".