From the conflict beyond the Wall to the spirited politics of Westeros and Daenerys Targaryen's liberation of Essos, there is a wealth of storylines to keep up with in Game of Thrones. All of these narratives result in a war, producing great casualities and even the extinction of Great Houses. Yet, in all the bloody battles and spiteful war of words, Game of Thrones barely touched on the history of conflict in Westeros.
Source:https://www.cbr.com/game-of-thrones-major-wars-from-books-excluded/