Unprecedented seems a little strong: https://en.wikipedia.org/wiki/Mongol_invasions_and_conquests https://en.wikipedia.org/wiki/Mongol_invasions_and_conquests

Unprecedented seems a little strong: https://en.wikipedia.org/wiki/Mongol_invasions_and_conquests https://en.wikipedia.org/wiki/Mongol_invasions_and_conquests https://en.wikipedia.org/wiki/List_of_wars_and_anthropogenic_disasters_by_death_toll https://en.wikipedia.org/wiki/List_of_wars_and_anthropogenic...