So I've been trying to win an OCC lately. This was my second attempt as Alexander on a Pangaea map, Standard game speed on King difficulty. I resolved to go for a cultural victory a little late in the game, realizing that I wouldn't be able to make the money or get in contact with enough city-states to win diplomatically...so while I chased after social policies and kept pace technologically with endless great scientists (I was 2nd in number of techs at the end) Babylon went along happily dominating nearly half of the Pangaea, with Wu conquering the other half. 10 turns to go on the Utopia Project then...bam! Babylon and China declare war, with the Babylonian army flooding across the border. I had a few Mech Infantry and one precious Atomic Bomb. Being very careful in my tactical planning, I drop the bomb partially in my own territory to damage almost all of his Rocket Artillery. Spoiler : After some fierce fighting, the hundreds upon hundreds of gold poured into maintaining my Walls, Castles, etc. pays off, and I just eek out the victory (with a rating as Neville Chamberlain ). Spoiler : Proof that the AI will declare war to prevent you from achieving victory? I think so.