Fort Apache was the first film of what would become known as director John Ford’s “Cavalry Trilogy.” Though Ford worked within the same historical period in other films, too, these three movies — Fort Apache (1948), She Wore a Yellow Ribbon (1949) and Rio Grande (1950) — were loosely tied together thanks not only their shared historical setting, but because they were released consecutively and featured period-appropriate music used as strong thematic elements, the role of Irish immigrants in the United States’ brutal expansion through Native lands, and a subversive, critical approach to the policies of the United States government.