As the armies of Mordor march on Gondor, Gandalf and Pippin race to Minas Tirith to rally its defense while Aragorn, Legolas, and Gimli lead the Grey Company along the Paths of the Dead to gather an army of the forsworn. The Battle of Pelennor Fields becomes the war's turning point, as Rohan's charge, Éowyn's stand against the Witch-king, and Aragorn's arrival with the dead combine to break Sauron's assault — buying time, but not victory.
While the armies of the West march on the Black Gate as a final, desperate diversion, Frodo and Sam, guided and betrayed in turns by Gollum, struggle through Mordor's wasteland toward Mount Doom, the Ring's corruption growing heavier with every step. The fate of Middle-earth rests not on armies but on whether one exhausted hobbit can complete an impossible task.
The concluding volume of The Lord of the Rings resolves the quest, the war, and the fellowship's individual fates, including Aragorn's crowning, the Scouring of the Shire, and the Grey Havens — Tolkien's meditation on loss, the passing of an age, and what victory costs those who win it.