LOTR: Dwarves Were Supposedly Great Dragon & Balrog Slayers, So Why Did Moria & Erebor Fall?

gamerant.com:

Of all the many races in Middle Earth, dwarves are arguably the most hardy. They are known for being strong-willed, proud, stubborn and head-strong. These qualities make them very good allies to have in a pinch, but also add to their conflict with the other races of the world, especially elves. But within this battle-worn and hardy race of beings, come some incredible warriors and leaders, who have managed to achieve remarkable things, and survive terrible tragedies for thousands of years. The dwarven kingdoms are some of the greatest in Middle Earth, and have yielded some of the best accomplishments. Their claims to fame include the discovery of Mithril, a rare and precious metal that later saves Frodo’s life; and the procurement of some incredible gems, like the Arkenstone. But these amazing feats do not come without their challenges for the dwarves, and as is well known, these vast hoards of gold often attract unwanted attention.

This is exactly what happens in the Mines of Moria, when Durin’s Bane, the large and menacing Balrog seen in the Fellowship of the Rings, killed the king Durin VI and ruined the once-mighty kingdom. Another perfect example is the fate of Erebor, with the death of king Thror, and the slaughtering of almost the entire race living in the Lonely Mountain, as well as the people living in the nearby settlement of Dale. These horrific events came at the fiery breath of Smaug the terrible, the malevolent dragon who later destroys Lake Town in The Hobbit. However, if the dwarves are such strong and fearsome warriors, why were their vast civilizations destroyed by the coming of the dragons and the Balrogs?

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