Nebular
Chieftain
The important thing to note here is that the consumed resource is released back into your pool when the unit dies or the building is destroyed. So if you have 4 iron and build 4 swordsmen, you'll be down to 0 iron for a while. When one dies, your available iron will go back up to 1 so you can build another unit/building that consumes iron. This is very briefly described in the Civilopedia if you dig around around enough or know where to look.Right. For example, if I had 4 iron, I would only be able to build 4 swordsmen, because each unit uses 1 iron. Same goes for building horsemen with horses, nukes with uranium, etc.