War of the Dwarves and Dragons
|Previous war: Orc skirmishes in the Misty Mountains|
|Next war: War of the Dwarves and Orcs|
|War of the Dwarves and Dragons|
|Beginning: 2570 TA||End: 2589 TA|
|Place: The Ered Mithrin|
|Outcome: Most of the Longbeards leave the Grey Mountains, and the Kingdom of Durin's folk there is dissolved. The surviving Dragons hoard their plunder.|
|Major battles: Battle of Dáin's hall|
|Durin's folk, Éothéod||Dragons of various species (Cold drakes, Worms, Long-worms)|
|*Thorin I *Glóin *Óin *Náin II *Dáin I||*Scatha *Smaug *Unnamed Dragons|
The defeat of Morgoth in the War of Wrath left the Dragons few and weak, hiding in the far North of Middle-earth. But over the millenia the Dragons multiplied and became strong once again. In T.A. 2570 the Dragons made war on the Dwarves of the Grey Mountains in the Ered Mithrin, sacking and plundering their halls and mines. The war lasted for almost twenty years, but in T.A. 2589 the Dragons attacked the halls of King Dáin I, and at the city gates a great Cold-drake killed the king and his second son Frór. With this last battle the war ended and the Dragons were victorious.
With the loss of their king, most of the Dwarves, led by the king's two remaining sons Thrór and Grór, left the Ered Mithrin. Grór took many of Durin's folk to the Iron Hills, while Thrór, now king, took his people to Erebor.