Inspired gy this thread, I went home after work last night and played one game start to finish (It took about 6 hours). I played the Babylonians, Monarch level, small pangea. It really wasn't very hard. It is true that during the middle ages, they were sending waves of knights in huge numbers, but 8 catapults, 5 musketmen, and 4 horsemen (I didn't have iron) held them off for hours without taking hardly any loses. I was still building wonders during the assault. I had the game won shortly after the first tank appeared, around 1920AD. Defending a single possition becomes very easy. I want to go try it on a hard level and see how it goes. I agree that building the great library is a must, it is the only way to stay competitive technologically. Another thing that helped was to trade for foriegn workers in the early game so I wasn't spending my hard earned cash on my own. Also, having 6-8 foriegn workers made building back up of my improvements really easy after each invasion (the catapults did wonders at keeping them from getting the improvements one square from the city).