The First Misery

The first recorded invasion of the right-minded nations of the world by the The Homuerto.
It raged for nearly a complete year before the main host was crushed by one of the first examples of a completely professional army, and even then continued on for another year before the invaders were driven back out to sea and their little pockets of resistance crushed.
Many nations were greatly damaged, looted, or both during the back and forth fighting.