They were attacked and defeated by the dragon Smaug. One might be surprised how one creature, however fierce and powerful, might defeat two entire cities (Erebor and Dale)y, particularly when Smaug was a young dragon, not yet fully-grown. Apparently Smaug's firebreath was decisive - there's reference to dwarves marching out the gates to fight him and being roasted. Perhaps if the dwarves had mounted a well-coordinated attack they might have defeated him, but taken unaware, with no coordination, Smaug was able to pick them off a few at a time and a few dwarves are no match for a dragon.
They had sent Biblo to investigate a nearby campsite which happened to have been occupied by trolls. Biblo got caught and eventually the dwarves came to rescue him. When they came they got captured by the trolls.
The dwarves hoards of gold attracted dragons to attack their kingdoms. Smaug is just one example of this. Four of the rings of power given to the dwarves, had been destroyed by dragonfire, more than likely while still being worn by their owners.
smaug stole it from them
The Dragon
yes because he wants the treasure and to kill the dragon.
There was a most specially greedy, strong and wicked worm called Smaug. He heard of the dwarven riches in the Lonely Mountain and came and killed many of the dwarves and took over their home in the mountain.
Most of the population of Lake Town think the dwarves are going to kill the dragon Smaug, and so treat them with kindness, hoping to get a share of the treasure. In fact all the dwarves do is annoy Smaug, who flies down the mountain and destroys Lake Town. Smaug is eventually killed by Bard.
They were a drain on the local economy. And everyone wanted to feast and it was costing a lot of money.
because he thought the men had hidden the dwarves
The dragon Smaug stole it.
Their treasure back.
In the beginning it was Smaug , then in the end of The Hobbit , Bilbo gains it
Dwarves had a bad habit of lusting after gold and treasure. Bilbo felt the desire burning in his heart when he saw the mounds of treasure in front of him.
King Thror's increasing hoard of treasure attracted the dragon Smaug. Dragons are particularly fond of gold and similar treasures. The dwarves of Erebor were unable to stop him.
To Reclaim their stolen gold from Smaug the Dragon.
A share in Smaug's treasure and adventure.
The dwarves are interested in (as dwarves are wont to be) tales of gold and treasure, and Beorn, having little use for these items - - he has everything he needs - - is not interested in material wealth.
The old wrong the dwarves wish to right is to reclaim their homeland, Erebor, which was taken over by the dragon Smaug. Their quest is defined by their desire to seek revenge on Smaug, recover the treasure of Erebor, and restore their kingdom to its former glory.
Bard demands a share of the treasure to help the people of Lake-town. The dwarves offer Bard a portion of the treasure, and the elves offer to help the dwarves in their quest. Ultimately, they all come to an agreement to share the treasure before a battle breaks out.
They were scared of Smaug and also believed from legend that only a group of Dwarves could kill Smaug and make the rivers run bright with treasure.
Because the dragon had taken the treasure from the dwarfs, so they wanted to reclaim as much of it as they could.Answer:Tolkien's dwarves are patterned after the Germanic and Norse dwarves. It is the nature of such dwarves to want as much treasure as they can get and keep it, this is much the same as the nature of dragons. Unlike dragons who saw the possession of gold as a good thing in itself and mostly sat and slept on their huge hoard, dwarves were skilled metal workers and viewed the treasure they hoarded as valuable for both its intrinsic value and its role as a raw material for their metal working. The magic of gold and jewels were essential for the amulets and weapons they produced.