 When Smaug attacks Lake-town, Bard is the last of the archers to stand his post, but the dragon is immune to arrows.However, a thrush speaks to Bard, showing him the weak spot in the dragon's armour in the hollow under Smaug's left breast, which Bilbo had discovered in his conversation with Smaug.He fires his favourite shaft, the family heirloom "Black Arrow", and kills Smaug, who falls onto Lake-town, destroying it.