Opened at the Martin Beck Theatre on April 1, 1941. Ran 378 performances, to about February 1942. Watch on the Rhine is a 1941 American play by Lillian Hellman. In an essay on World War II, a contributor to The Companion to Southern Literature (2002) wrote that the play's "peculiar combination of drawing-room comedy in a genteel southern home with sinister corruption of the Nazi regime in Europe made for a unique and powerful drama, one strong enough to win the New York Drama Critics' Circle Award." Wiki link