The journey becomes quite difficult as the group gets caught in a mighty storm—a "thunder-battle" filled will rain, lightning, hail, and giants who are throwing boulders that destroy the forests. The two young dwarves, Fili and Kili, are sent to search for a safe place to lie down, and they quickly return. The cave Fili and Kili select appears to be perfect; in the middle of the night, however, the back wall opens, and out pour goblins who take all the ponies and capture the dwarves and Bilbo Baggins.
Fortunately Bilbo awakes from a nightmare in time to see the ponies being led away; he yells, which gives Gandalf enough time to escape. The Great Goblin plans to enslave or kill them, but then he comes across Thorin's sword, called Orcrist the Goblin-cleaver (which the goblins called Biter), and he becomes enraged. "Murderers!" he shouts, and at that moment, Gandalf reappears in a tower of smoke and sparks. In the chaos, Gandalf grabs the sword and kills the Great Goblin, allowing the dwarves to make off in a hurry. Dori, one of the dwarves, carries Bilbo on his back but falls. Bilbo hits his head and is knocked out.
This is not my work, all credit for the audio goes to @Bluefax
Image Credit : © 2011 Fantasy Flight Games