Thanks rktman.
The Cycle of Cosmic Catastrophes:
Flood, Fire, and Famine
in the History of Civilization
by Richard Firestone,
Allen West, and
Simon Warwick-Smith
Suspicious 0bservers, note that the O in 0bservers is a zero...
...and that's why I have a 5,000 year project...
As soon as I saw the title, I immediately thought. Well, the big cosmic strikes in North American could certainly have upset the regular Nile flood cycle for a number of years, ergo warfare. For people who have not read The Book, I encourage you to do so, it was very interesting. It also gave information that made some of what I had read in Velikovsky more understandable, like massive bone beds in areas of Canada.