BILL CRIDER'S POP CULTURE MAGAZINE
I guess the people who compiled this list have never watched Fort Apache, She Wore a Yellow Ribbon or Rio Grande.
True Ivan, but strictly speaking the Cavalry Trilogy was not a true trilogy. While Wayne, McLaglen and Harry Carey Jr. were in all three movies they don't play the same character in them. McLaglen dies in the first movie of the trilogy - Fort Apache, retires in She Wore a Yellow Ribbon, and is active and has a young niece (Margaret Mary) in Rio Grande. The Cavalry Trilogy thus lacks the continuity of characters found in a true trilogy.