Game of Thrones S04E01: a group of Wildlings led by Tormund Giantsbane is waiting Mance Rayder's signal to attack the Wall from the South, when the Thenns arrive led by Styr, the Magnar of Thenn.
Game of Thrones S05E08: Lord Commander Jon Snow and Tormund Giantsbane are at Hardhome to persuade the WIldlings to get South of the Wall passing through Castle Black to escape the army of the Night King; many Wildlings leaders, such as Karsi and Wun Wun the last giant, accept this peace offer while other tribes, like the Thenns, still don't trust the King Crow.
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