Rio Grande (1950) is the third Cavalry Trilogy film. Set in the Old West, Lt Colonel Kirby Yorke (John Wayne) commands the 2nd US Cavalry Regiment patrolling the Texas frontier against marauding Apaches. Yorke gets two surprises, one of the new recruits is his son Trooper Jefferson Yorke (Claude Jarman Jr) who failed out of West Point and enlisted as a lowly trooper. A bit later Yorke's estranged wife Kathleen (Maureen O'Hara) arrives to take Jefferson home. But when Jefferson refuses Kathleen sticks around and the fire between Kirby and Kathleen is reignited...

Men in uniform, horses, personal drama, fighting Indians. It's still a great old (black and white!) movie and I thoroughly enjoyed watching it.