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They had been incited by Gandalf's earlier slaying of the Great Goblin, but had now mobilized for a full-scale attack after hearing news of the death of the Dragon and the now relatively unguarded treasure hoard. When Dáin's forces arrived, a battle was almost joined between the two sides (now three armies were on the field) but at the last moment, Gandalf intervened between the two and revealed that while they were bickering amongst themselves, the Goblins of the Misty Mountains and Grey Mountains under Bolg were using the opportunity to march against them. These reached Dáin II Ironfoot of the nearby Iron Hills, and he marched to the Lonely Mountain with 500 heavily armed Dwarves, most skilled veterans of the War of the Dwarves and Orcs. However, Thorin had sent messages of his plight to his relatives using talking messenger Ravens that lived on the Lonely Mountain.
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Thorin and Company were then trapped in a bloodless siege, with Thranduil and Bard hoping to wait them out.
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