 He was convinced of their trustworthiness after confirming their tale of encountering the Goblins of the Misty Mountains and Gandalf's slaying of their leader, the Great Goblin.In addition to giving the group much-needed supplies and lodging, Beorn gave them vital information about what path to take while crossing Mirkwood.Later, hearing of a vast host of Goblins on the move, Beorn arrived at the Lonely Mountain in time to strike the decisive blow in the Battle of Five Armies.