Legends Of The Fall is an epic drama that spans the lives of the Ludlow family. It is set in the early 1900s, around the time of the First World War. The story is told through the eyes of One-Stab (Gordon Tootoosis), an Indian chieftan.
Colonel Ludlow (Anthony Hopkins) is a military man who quits the American army as a result of atrocities he sees committed against the American Indian people. He sets up in the middle of the wilderness with his wife, Isabel (Christine Pickles) and his three sons; Alfred (Aidan Quinn), Tristan (Brad Pitt) and Samuel (Henry Thomas). One-Stab, along with several others, lives with them.
Soon, Isabel Ludlow realizes that the wilderness life is not for her, and she leaves Colonel Ludlow, though they remain fond of each other. Colonel Ludlow is left to raise his boys as best he can on his own. One day, Samuel meets a woman with whom he falls in love, Susannah Fitzgammon (Julia Ormond). He brings Susannah to the family home, and things are very good for a time.
World War One begins, and the three boys all enlist in the army. Samuel is killed, despite Tristan's best efforts to save him. Tristan sends back Samuel's heart to be buried at home, and then he goes away for a time to deal with his grief. Alfred during this time is at home with Susannah, and he attempts to win her heart, unsuccessfully. Tristan returns, and sweeps Susannah off her feet. Alfred leaves the family home to set up in Helena, a nearby town, in business.
Tristan becomes more and more unsettled, and finally he leaves Susannah to go wandering the world in an attempt to find himself. Much time passes, and no word is heard from Tristan until one day Susannah receives a brief note from Tristan exhorting her to "Marry another".
More time passes, and finally Tristan returns to the homestead. We learn that Colonel Ludlow has had a stroke and has lost the ability to speak, and Susannah has married Alfred whilst Tristan was gone. Tristan falls in love with Isabel Two, who was only a girl when he left home, but is now a woman. They marry, and have two children. During this time, Tristan industriously runs a bootlegging operation. He falls foul of other bootleggers, and Isabel Two is killed accidentally in an ambush.
This leads to two revenge killings by Tristan and by Isabel Two's father, and this then leads us to the climactic end sequence of the movie, where loose ends are tied, and honour is served.