The Rumbling (地鳴らし Jinarashi?) was a cataclysmic event involving Karl Fritz's Wall Titans marching across the earth, destroying all life upon it. For over a century, it was a key deterrence factor for the Subjects of Ymir on Paradis Island until the year 854 when Eren Yeager unhardened the Walls, freed the Wall Titans, and began the Rumbling. Over the course of four days after first setting foot on the continental mainland, the Rumbling brought about the complete destruction of the northern