Set in World War I amidst the incredibly destructive and futile trench warfare between France and Germany, the film stars Douglas as Frenchman Colonel Dax, who is ordered to make an impossible assault on a heavily-fortified enemy position.
The only reason this charge is being made is that his commanding general believes that capturing the position will earn him a promotion. When the assault fails, the infuriated general demands that three men be randomly chosen to stand trial for cowardice, an offence punishable by death. Col. Dax defends these men at their court-martial.