There are a couple of points that've never been too clear to me. They are about Macemen and crossbowmen. Ok, macemen need civil service, but they both need machinery. In the end, they always become available at the same time. I don't know why macemen need machinery (it doesn't even sound logical). They could be enabled by civil service only, thus creating completely different tech paths for these two units (like as for knights). Secondary, required resources are "funny". Crossbowmen need iron (why???), while macemen need either iron or copper. Macemen are stronger than crossbowmen, so they should have more building limitations than the others; they wear iron armors and use iron maces. Besides, Crossbowmen could also be built with copper only; they don't seem to wear iron armors, and their weapons are made with wood (and maybe a little amount of metal). I swap their requirements, enabling crossbowmen with either iron or copper, and macemen with iron only. These two little changes would drastically change the middle ages game. Crossbowmen would be easier to build, and would be enabled by a completely different tech path than macemen. In addition, macemen would pay their superior strength with an higher resource requirement.