Earlier today, Warner Bros. held a global fan event for The Hobbit: The Desolation of Smaug, where the studio debuted the third trailer for this highly-anticipated sequel. This three-minute video includes previously-unseen footage featuring a battle between the dwarves and the elves, along with the dragon Smaug, voiced by Benedict Cumberbatch. Watch the latest scenes from director Peter Jackson's Middle Earth adventure, in theaters December 13.