[GOP_1900AD]

I hadn't thought of that one... that would be pretty bad....

[BabsC]

Have you read Sun Tsu, The Art of War.

Common sense dictates you always go for the high ground. Develope a base on the moon and look "down" on the earth. All you really need to do is throw big rocks with the right trajectory.

Quite a few Science Fiction novels and short stories have been based on the premise of what would happen if different cultures gained that upper hand.