I play a lot of practice matches, 3v3, against hard AI. I have been able to go up against any other civilization thus far without much trouble, but I cannot for the life of me manage to get ahead of the Koreans. The first problem is that they rush me so quick that I can barely hold them off, but the bigger problem is that the War Wagon is impossible to deal with. They get so many of them and they tank so much that I simply waste all my resources just trying to get to them. They overwhelm me with so many wagons that multiple castles in the same place cannot even hold them off.