The "War of the Ring" is a central conflict in J.R.R. Tolkien's epic fantasy novel, "The Lord of the Rings." It involves the struggle between the forces of good, led by the Free Peoples of Middle-earth, and the dark power of Sauron, who seeks to reclaim the One Ring to dominate all of Middle-earth. Key groups in this war include the Hobbits, Men, Elves, and Dwarves. The war unfolds across various locations, including Rohan, Gondor, and the Shire. Major battles, such as the Battle of Helm's Deep and the Siege of Minas Tirith, showcase the bravery of the Free Peoples. Ultimately, the fate of Middle-earth hinges on the quest to destroy the One Ring in the fires of Mount Doom.