I'm re-listening to the audiobook of The Hobbit. I'm at the part right before the Battle of Five Armies begins. Thorin & Co. are besieged within the mountain. I understand Bard's claim on a portion of the treasure for Dale and Laketown, but I don't understand why Thranduil is there. Is it really just out of greed? He heard that there was an unprotected mountain of gold and wanted some of it? Please tell me I'm missing something.