The eclipse that stopped a war

Two armies had been fighting for five years when the day went dark on them, and they put down their weapons and made peace on the spot.

Herodotus says Thales of Miletus had foretold the year. The Medes and the Lydians were drawn up on the river Halys when the Sun went out, and the shock of it produced a treaty sealed by a royal marriage. It is often called the earliest event in history that can be dated to the day, because only a new moon can do that to the Sun.