The war will be after a comet fall

Tolstoy Leo : writer
Comet in 1812 year predicted the War with Napoleon. At the midpoint of War and Peace, Tolstoy describes the character of Pierre observing this "enormous and brilliant comet [...] which was said to portend all kinds of woes and the end of the world". The comet was popularly thought to have portended Napoleon's invasion of Russia (even being referred to as "Napoleon's Comet") and the War of 1812, among other events.

Novel "War and Peace"