As burglar, Bilbo is sent down the secret passage to the dragon's lair. He steals a golden cup and takes it back to the Dwarves. Smaug awakes and instantly notices the theft and a draught of cold air from the opened passage. He flies out, nearly catches the Dwarves outside the door, and eats their ponies. Bilbo and the Dwarves hide inside the passage. Bilbo goes down to Smaug's lair again to steal some more, but the dragon is now only half-asleep. Bilbo, wearing his magic ring, is invisible, but Smaug at once smells him. Bilbo has a riddling conversation with Smaug, and notices that the dragon's armour has a gap. He escapes the dragon's flames as he runs up the passage, and tells the Dwarves about the gap in Smaug's armour. An old thrush hears what he says, and flies off to tell Bard in Lake-town.