How Big Was the Battle of the Gullet in George R.R. Martin's Lore?

House of the Dragon Season 3 is gearing up to adapt one of the most violent and exciting battles in Westeros history amid the Dance of the Dragons, and it's a major event that fans have been looking forward to since the disappointing Season 2 finale. With the stage set beautifully for this epic conflict to take place, the Battle of the Gullet is set to be both a series and franchise highlight, likely bigger than anything Game of Thrones ever brought to screen.