Fool's Gold - S1.E16

Marshal Crown and his posse thwart a payroll robbery and capture or kill all the entire outlaw gang. The leader is sentenced to ten years in territorial prison, but Crown can't gather enough evidence to charge the youngest member. When the youth decides to stay in Cimarron, the marshal arranges for him to work with an reclusive horse trainer and the youngster takes to both the job and his new boss. His new loyalty is put to the test when the gang leader escapes from jail and returns to Cimarron seeking revenge.