Erebor
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. In his bear form he slew the Goblin leader, Bolg and his bodyguards. Without direction, the Goblin army scattered and were easy pickings for the other armies of Men, Elves, Dwarves, and Eagles. Beorn often left his home during the narrative of "The Hobbit" for hours or days at a time, for purposes not completely explained.