You're right, I recall now war in heaven is mentioned in Revelation 12. But it's a matter of interpretation as to when that war occurred and what specifically it is talking about.
Interesting stuff you're talking about there, regarding human history that took place over 15,000 years ago. I've heard of the Younger-Dryas theory, but I need to read up more on it. When you go back much more than 5,000 years you get into pre-history, before any surviving written texts, so I'm not sure about the sources of the information concerning what happened prior.