I spent most of the last half of the ancient age at war with Babylon and those they drew in against me, after I flipped them the bird when they demanded 21 g. This was a bad idea, of course... (conquistadors really suck when you are leaving cities empty - I lost a couple to long-range spanish attacks)
Then, after I got into the middle ages and got some medieval infantry, I attacked carthage to gain some territory and some techs - I just got the territory - the great wall kicked my ass (and the game, too - kept crashing)
the drive to the sipahi was uneventful, but when I got them, I had some problems - not enough money to upgrade my horsemen en masse, and they are expensive to build.
So I ended up selling off all my libraries and temples (which causes problems later), to get cash.
The sipahi are much fun, btw. They are pretty much an unfair advantage
I attacked carthage to extort techs - unfortunately, after I took out their 3 cities near me, they wouldn't talk, so I had to build a caravel to go "invade" their territory and shut them up. That got me to, I think, Astronomy - but Greece was in the IA, so signed a MPP with china.
I thought - ah, heck. how bad could that be? so prepared to attack Greece (my golden age went to making sipahi and building up a fair cash reserve)
Then Spain attacked for no reason, and I brought Babylon in to deal with that.
Unfortunately, all that pulled some of my sipahi away, so my initial attack on Greece wasn't as concentrated as I would have liked.
But with some back and forth (I lost one of my towns 3 times because I couldn't get rid of athens fast enough and he would always send his new cavalry to take it...)
I got rid of Greece, and extorted some techs.
Unfortunately, the game looks pretty hopeless right now - Babylon is a monster who is close to domination, and must be 8 techs ahead by now in the IA - I'm just now getting electricity, and they completed Theory of Evolution.
I may play it out - Babylon demanded tribute and I flipped him off and dragged spain and china in - and I'm holding him off, but it's only a matter of time before he shows up with forces I *can't* handle, and I've been unable to go on the advance to mess him up.
Lack of leaders has been a huge problem - I spent probably 2/3 of this game at war and got my first leader in 1580 AD!!
But it's been fun - and, frankly, I'm surprised I made it this far, especially with my early mistakes. I have to admit, I used to worry about deity level war, and the big problems I run into is when I act like the AI, and break up my attackers, instead of concentrating them...