In 1805, Lewis and Clark heard cannon fire booming across the Montana plains—no army, no storm, no explanation. Native tribes had reported the same eerie sound for generations. Two centuries later, scientists still can't fully solve the mystery of the "unaccountable artillery of the Rocky Mountains." Web: https://www.bigskytreasure.org/history/mysteries/unaccountable-artillery #WorldHistory #USHistory #MTHistory #Montana #History #BSTS #Fourosix #MontanaToday #histodons