Sorry if this has already been covered. But currently I see little to no reason to build swordsmen. Even when attacking a city, a swordsman only gets 10% attack bonus vs 50% that a defending axeman gets vs that swordsman. Making swordsmen is failrly worthless if your opponent has iron or copper. The only agruement I CAN see for swordsman is if your opponent is defending with archers. But even then, I would argue that you are safer building axemen, in case your opponenet does suddenly get axemen.