5) breaks games where you don't have Unlimited National Units on. National units must obsolete when the new unit comes along. The alternative is to have two units definitions for each national unit one for normal play and another for when the Unlimited National Units option is on 6) Indian or African elephants? In theory there should be one herd for each type of unit. The herd placing is based on both when terrains can be modified with tools ie not through slash and burn and when improvements can be built on that terrain. This means that iron working is needed to build a herd with pasture on forest or jungle.