The Wagons Roll at Night is a 1941 American circus drama film directed by Ray Enright and 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 Nick's sister, played by Joan Leslie.

[1] The screenplay is by Fred Niblo Jr. and Barry Trivers, and the film is based on the 1936 novel Kid Galahad by Francis Wallace, first published as a serial in The Saturday Evening Post.

In 1962, United Artists produced a musical remake of the "boxing" version of Wallace's story under the same title, directed by Phil Karlson and starring Elvis Presley as the boxer.

[3] An aggressive lion named Caesar escapes from a traveling circus owned and managed by Nick Coster, but is cornered in a grocery store by clerk Matt Varney.

Seeing that Matt has become an instant celebrity with the town's residents, Nick hires the farm boy to work with his current lion tamer, Hoffman the Great.

Matt uses his skills against Caesar, but is fighting a losing battle, as the unloaded gun has no effect in scaring the lion.