Sauron arose again and challenged them. The Elves allied with Men to form the Last Alliance of Elves and Men. For seven years, the Alliance laid siege to Barad-dûr, until at last Sauron himself entered the field. He slew Elendil, High King of Gondor and Arnor, and Gil-galad, the last High King of the Noldor in Middle-earth. However, Isildur took up the hilt of Narsil, his father's shattered sword, and cut the One Ring from Sauron's hand. Sauron was defeated, but not utterly destroyed. Afterward, Isildur ignored the counsel of Elrond, and rather than destroy the One Ring in the fires of Mount Doom, he kept it as weregild for his dead father. But the Ring betrayed him and slipped from his finger as he was escaping from an Orc ambush at the Gladden Fields. Isildur was killed by an orc arrow, and the Ring was lost in the Anduin River.