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During the War of the Ring, Thrandel was one hundreds of Silvan Elves that followed Haldir to Helm's Deep and provide their support and aid to the people of Rohan and their king from the terrible atrocities that Saruman, who betrayed the White Council and became a servant of the Dark Lord Sauron. Stationed at the Deeping Wall with all of his kin, Thrandel demonstrated his skills as an archer and killed a large number of Uruk-hai that were climbing the wall. As he kept on fighting to defend Rohan's people, Thrandel was slain in the battle, but he would be remembered of those that gave their lives in defending Rohan from the armies of Isengard.
- The Two Towers (film) (First appearance)
- Thrandel does not appear in any of the book.