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LotR Erebor

The Lonely Mountain, known in Sindarin as Erebor, referred to both a mountain in northern Rhovanion and the subterranean Dwarven city contained within it. In the latter half of the Third Age, it became the greatest Dwarven city in Middle-earth.

It was located northeast of Mirkwood, near the Grey Mountains, and was the source of the River Running.

During the War of the Ring, at the same time Minas Tirith was besieged, an army of Easterlings, under Sauron's rule, invaded the Kingdom of Dale after Brand was driven back to Dale and Erebor. The Dwarves aided the Men of Dale who fought in the great battle at the feet of the Mountain for three days, before King Brand and King Dáin were killed at its very gates, forcing Men and Dwarves to retreat into the mountain. They held out for several days until word reached the ears of the Easterlings that the great hosts of Sauron in the south had been defeated, who despaired and lost hope. When the besieged saw this they came forth from the Lonely Mountain, and attacked their enemy driving them from Dale across the Running.

Erebor and Dale continued to prosper into the Fourth Age, with it still prospering and going strong even after the Longbeards reclaimed Khazad-dûm.