In The Hobbit : The Desolation of Smaug Thranduil offered to help Thorin to get Erebor 's starlight crystals in return but Thorin refused .
Thorin confronts Thranduil about his neglect of the Dwarves of Erebor following Smaug 's attack 60 years earlier , and is consequently imprisoned with the other Dwarves .
The Hobbit-COLON- The Desolation of Smaug