"The U.S. Army needs more horses for the Spanish-American War. Hoppy must turn his Bar 20 cowhands into Rough Riders to gather up the horses, and of course bad guys try to sabotage the operation."
William Boyd
as Hopalong Cassidy
Russell Hayden
as Lucky Jenkins
George 'Gabby' Hayes
as Windy Halliday
Judith Allen
as Barbara Allen
Billy King
as Boots
Alexander Cross
as Black Jack Carson
Karl Hackett
as Major McCready
Bob Kortman
as Hawks
Jack Rockwell
as Shorty
John Beach
as Smokey
Ray Bennett
as Brad
Philo McCullough
as Jordan
Ben Corbett
as Fort Guard
Jim Corey
as Henchman
Earle Hodgins
as Major Jordan
John Judd
as Army Lieutenant
Clyde Kenney
as Courier
Leo J. McMahon
as Army Corporal
Buck Morgan
as Hoppy Man
Cliff Parkinson
John Power
as Fort Cook
David Selman
Director
Sherman A. Rose
Editor
Lewis J. Rachmil
Art Direction
Russell Harlan
Cinematography
Harry Sherman
Producer
Jack O'Donnell
Screenplay
Clarence E. Mulford
Story
Karl Zint
Sound
Earl Sitar
Sound Engineer
Ralph Ravenscroft
Production Manager
Derwin Abrahams
Assistant Director
Harrison Jacobs
Additional Dialogue
Theodore Joos