During the War of the Ring, he came to the aid of Minas Tirith with his two sons, Duilin and Derufin, and five hundred bowmen, in the Battle of the Pelennor Fields. Duinhir was notably tall and was seen by Bergil and Pippin as he rode through the White City. However, as with all the others who came to help Minas Tirith, Duinhir came with too few men to accomplish a secure victory. Duinhir's sons tragically died in the battle, while the fate of Duinhir himself is not known, as no account has been given.
- The Lord of the Rings pg. 270
- Duinhirat Encyclopedia of Arda