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

Paul Kelly
as Lt. Col John Hudson

Philip Carey
as Capt. Edward Tennick

Lon Chaney Jr.
as Pete Elm

James Millican
as Matthew Quint

Guinn 'Big Boy' Williams
as Sgt. Snow

Alan Hale Jr.
as Mizzell

Martin Milner
as Pvt. Olie Larsen
CinemaSerf
With all the pomp and ceremony of a dishonourable discharge, "Kearney" (Gary Cooper) is drummed out of his regiment for having a much broader yellow streak on his trousers than usual. Leaving in disgrace, he is soon embroiled with some horse thieves, led by the aptly named "McCool" (David Brian), wh...