The Wagons Roll at Night

The Wagons Roll at Night is a 1941 circus film directed by Ray Enright, starring Humphrey Bogart as traveling carnival owner Nick Coster, Sylvia Sidney as his girlfriend, and Eddie Albert as a newcomer who falls in love with Nicks sister. The screenplay is by Fred Niblo Jr. and Barry Trivers, and the film is based on a 1936 novel by Francis Wallace, first published as a serial in The Saturday Evening Post.

Source: Wikipedia