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The Winter Wolves were the northmen soldiers under the command of Lord Roderick "Roddy the Ruin" Dustin that supported the claim of Rhaenyra Targaryen. They joined the blacks against the greens during the Dance of the Dragons.
Upon the outbreak of civil war Prince Jacaerys Velaryon traveled to White Harbor and Winterfell to ask the Manderlys and the Starks to support the blacks. Cregan Stark, Lord of Winterfell and Warden of the North, sent two thousand soldiers, the so-called Winter Wolves, under the command of Lord Roderick Dustin south to aid the blacks after they gathered at Barrowton. The Manderlys separately sent knights under the command of Ser Medrick Manderly and Ser Torrhen Manderly to support the claim of Rhaenyra Targaryen.
The grizzled Winter Wolves rode shaggy northern horses and used axes, mauls, spiked maces, and ancient iron swords. They led the attack and charged the Lannister spearmen five times in the battle by the Lakeshore, with two-thirds of the northmen killed or wounded in their victory. In the Butcher's Ball, Lord Dustin sounded the charge of the northmen and their river knight allies against Ser Criston the Kingmaker.
Screaming northern war cries, the surviving Winter Wolves rode from a postern gate in the first Battle of Tumbleton. Although outnumbered ten to one, Roderick led the northmen to strike at Lord Ormund Hightower. Roddy the Ruin managed to slay Lord Ormund and Ser Bryndon Hightower before succumbing to his wounds.