> "You may think that Rivendell was out of his reach, but I did not think so. The state of things in the North was very bad. The Kingdom under the Mountain and the strong Men of Dale were no more. To resist any force that Sauron might send to regain the northern passes in the mountains and the old lands of Angmar there were only the Dwarves of the Iron Hills, and behind them lay a desolation and a Dragon.
This is about Sauron's moving from Dol Guldur against Rivendell.
@tchrist I don't understand why he should have to pass Erebor, much less the Iron Hills.
@tchrist I also don't understand how Smaug could "take" Erebor from the dwarven kingdom.
A mountain should be the best defence possible against a dragon.
Does it make sense to you?