The concluding section of the book, comprising about 20 pages, describes the events that take place in Middle-earth during the Second and Third Ages. In the Second Age, Sauron re-emerged in Middle-earth. The Rings of Power were forged by Elves led by Celebrimbor, but Sauron secretly forged One Ring to control the others. War broke out between the peoples of Middle-earth and Sauron, culminating in the War of the Last Alliance, in which Elves and the remaining Númenóreans united to defeat Sauron, bringing the Second Age to an end. The Third Age began with the claiming of the One Ring by Isildur after Sauron's overthrow. Isildur was ambushed by orcs and killed at the Gladden Fields shortly afterwards, and the One Ring was lost in the River Anduin.