Why did the First Men change their religion and begin worshipping the Old Gods of the weirwood? Why did they sign a peace treaty with the children of the forest when they were wining the war? I've got a great answer for you, and I'll also explain the real origin of the Night's Watch and generally just straighten out the timeline - but it might be a little bit of heresy.

Disaster Hunters playlist: https://youtube.com/playlist?list=PLEHvft-cyPmBTyeKzxuuBl2EmMW1QPgp8