The Last Alliance of Elves and Men was that made between Gil-galad, the High King of the Noldor, and Elendil the High King of both Gondor and Arnor.

They joined together against Sauron at the end of the Second Age, and marched upon Mordor, and there the War of the Last Alliance occured.

Sauron was defeated, the One Ring was taken, and Barad-dûr was under siege.
Encyclopedia entry originally written by atalante_star