Battle of the Bastards (Season 6, Episode 9)

"Battle of the Bastards" is the ninth and penultimate episode of the sixth season of HBO's fantasy television series Game of Thrones and its 59th episode overall. It was written by series co-creators David Benioff and D. B. Weiss, and directed by Miguel Sapochnik.

Jon Snow and Ramsay Bolton face off in a battle for control of Winterfell. The Bolton army defeats most of Jon's force, mostly composed of Wildlings, but are overcome when Sansa Stark and Petyr Baelish arrive with the Vale Knights; the battle culminates in Ramsay's defeat and capture. Meanwhile, Daenerys Targaryen defeats the Masters in Meereen and begins making new alliances.

https://en.wikipedia.org/wiki/Battle_of_the_Bastards