Brothers Beau, John and Digby Geste join the Foreign Legion, where they fall under the rule of tyrannical Sergeant Markoff. Beau and John are assigned to Fort Zinderneuf, where Markoff tries to break their spirit, aware of a dark family secret concerning a fabulous jewel one of them carries. As tensions rise, Arabs attack the fort and rivalries must be thrown aside in a desperate battle for life.

Gary Cooper
as Beau Geste

Ray Milland
as John Geste

Robert Preston
as Digby Geste

Brian Donlevy
as Sergeant Markoff

Susan Hayward
as Isobel Rivers

J. Carrol Naish
as Rasinoff

Albert Dekker
as Schwartz

Broderick Crawford
as Hank Miller

Charles Barton
as Buddy McMonigal

James Stephenson
as Major Henri de Beaujolais
John Chard
Wonderful, just blooming wonderful. Gary Cooper, Ray Milland and Robert Preston play three orphaned brothers who are raised at Brandon Abbas by their aunt Lady Patricia Brandon. When money troubles hit the household, attention focuses on the Blue Water Sapphire, the last remaining wealth in the B...