News From a Distant Planet:

The origin of those from the distant planet
is told as such: a man encountered a crashed
spacecraft some 15 000 years ago. The pilot
of the craft stepped out wobbly and fell to
the ground. The man ran to his side. The pilot told
him that he was an advanced scout for a civilization
10 00 years away that intended to invade. He claimed
to be the offspring 10 000 years removed from the original
scout. Over the time he had traveled, the pilot had lost
all sense of his parent culture, and wished to warn the
distant planet of the impending attack. The pilot died
shortly thereafter. The man rushed about attempting to
tell everyone. Once the entirety of the planet was more
or less informed, they began a process of arming and
preparation. The planet underwent a colossal war measures
upheaval. Generation upon generation were dedicated to the
defense of the distant planet. By the time the invaders
had arrived, the people of the distant planet were ready.
Their people had been trained for thousands of years for
this very purpose. They were a celestial Sparta. When the
invading ships saw the amassed armies, they abandoned their
original peaceful plan, praising the forethought of their
forebears who had intended war, which the subsequent
generations had abandoned. They vaporized the population
of the distant planet in an instant. Thus is the origin
of those now dwelling on the distant planet.