After the events of The Hobbit, Erebor, also known as the Lonely Mountain, was freed from the dragon Smaug and the Dwarves settled there once more. Dáin Ironfoot became the king of Erebor after Thorins death. Erebor prospered for a few decades, with Dwarves from across the land returning to their home and jewels passing through the rebuilt city of Dale. However, Erebor faced ruin again with the return of Sauron. During the War of the Ring, hordes of Easterling soldiers swarmed into the North to attack Erebor. The Dwarves and the Men of Dale took shelter inside the Lonely Mountain, which was surrounded by Saurons army. Erebor took a small hit, but it was rebuilt during the Fourth Age with the help of men and all of the Dwarves. With the restoration of the Kingdom under the Mountain, the area became prosperous again, and Dwarves and Men reforged their friendship. Dáin was killed during the War of the Ring, and was succeeded by his son Thorin III Stonehelm who ruled well into the Fourth Age. During this time, Dwarves from the Lonely Mountain helped rebuild cities in Gondor and the fortress of Helms Deep, and some went to the newly established Dwarven realm.