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
