Albert Einstein and others inform FDR of the possibility of creating an atomic bomb. First German air raid on the British Isles. German troops invade Denmark and Norway. British forces land in Norway. Holland, Belgium, and Luxembourg are invaded by Germany.
British troops enter Belgium.
Holland surrenders to Germany. German troops march toward the Arc de Triomphe in Paris. First all night air raid on London. British win battle of Britain. Japan joins the Rome-Berlin Axis .