Major Lex Kearney, dishonourably discharged from the army for cowardice in battle, volunteers to go undercover to try to prevent raids against shipments of horses desperately needed for the Union war effort. Falling in with the gang of jayhawkers and Confederate soldiers who have been conducting the raids, he gradually gains their trust and is put in a position where he can discover who has been giving them secret information revealing the routes of the horse shipments.
Gary Cooper
as Maj. Alex 'Lex' Kearney
Phyllis Thaxter
as Erin Kearney
David Brian
as Austin McCool, Raider Leader
Paul Kelly
as Lt. Col John Hudson (Ft. Hedley CO)
Philip Carey
as Capt. Edward Tennick
Lon Chaney Jr.
as Pete Elm (as Lon Chaney)
James Millican
as Det. Matthew Quint
Guinn "Big Boy" Williams
as Sgt. Snow
Alan Hale Jr.
as Mizzell
Martin Milner
as Pvt. Olie Larsen
Wilton Graff
as Col. George Sharpe
George Eldredge
as Judge Advocate (uncredited)
