After escaping the Goblins initially during the first attack, he follows the Goblins and their captives to the Goblintown. When the Great Goblin was about to attack Thorin, Gandalf revealed himself, drawing his sword, Glamdring, white emitted burning, white sparks that burned into the Goblins around him. He slew the Great Goblin and led the Dwarves out of the tunnels in the confusion, Bilbo accidentally getting lost along the way out.
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By throwing his voice, he confused the trolls and got them fighting amongst themselves. They argue and fight till the sun comes up and they are all turned to stone.
Gandalf doesn't actually turn them into stone, but it was the sun's rays, for trolls cannot be out at dawn or else they turn into what they are made of stone.
He uses some of his magic with fire. Gandalf was able to disappear and avoid being captured by the goblins because of Bilbo's warning shout. He then made the goblin's fire burst out brightly and used his sword to kill the goblin king.
Gandalf saves Bilbo several times. He saves the party from the Trolls. Gandalf gets them away from the Goblins. His friendship with the eagles helps them greatly. With no supplies, he connects them with Beorn and he re-supplies them.
He made his voice sound like one of the troll's voices and then said things that started arguments over and over again until the sun came up and the troll's froze into statues.
Gandalf threw his voice and got the trolls arguing with themselves. That led to them forgetting to return to their cave before the sun rose.
Gandalf threw his voice and got the trolls arguing with themselves. That led to them forgetting to return to their cave before the sun rose. Which turned them into rocks.
Gandalf knows the Lord of the Eagles. He speaks to them, and the eagles save them. Another reason is because they do not enjoy the goblins.
When Bilbo, the dwarves, and Gandalf were trapped up in fir trees with wargs (evil wolves) and goblins beneath them, the eagles (including the Lord of the Eagles) swept down from the mountains and carried the Company to safety in their eyries.
He takes it upon himself to save the dwarves, multiple times (from the spiders and the elves most notably.)he was a hobbit who knew how to sneak around places without being seen
Bilbo demonstrates selflessness multiple times in "The Hobbit," most notably when he offers to take on the role of burglar for the dwarves despite his initial reluctance and fear. He also risks his own safety to save the dwarves from spiders in Mirkwood Forest and from imprisonment by the Wood-elves. Additionally, Bilbo shows selflessness when he spares Gollum's life during their encounter in the dark caves, choosing not to kill him despite the potential threat.
At the end of chapter 17 of The Hobbit, Bilbo is in the Battle of Five Armies and is just thinking that all hope is lost for the Dwarves and Elves and Men when he sees an army of eagles soaring toward them. Bilbo shouts, "The Eagles! The Eagles!" But then, a stone thrown by a goblin hits his head on the helm, and he falls down and blacks out.