Summary: Foreign agents are smuggling monium (a chemical used in producing poison gas) into Mexico. The three Mesquiteers bet involved when they ride to save a girl (really a government agent) on a runaway horse. (imdb)

Genre: Western

Country: USA

Directed By: George Sherman

Written By: Stanley Roberts, Betty Burbridge

Starring: John Wayne, Ray Corrigan, Max Terhune, Doreen McKay, Joseph Forte

More information at the Internet Movie Database