a question comes to mind, where are all the supplies coming from? if you're fighting war, you're not tending fields or hunting, so is there that much wildlife to hunt? or past stored supplies? or artifacts that can generate food? or funger-style infinite alchemy?
by ancient numbers, it takes anywhere from 5-10 farmers to feed a full time soldier, even if we add in magic it's hard to get below a 1:1 ratio (this requires mechanical automation as far as farming goes), so whence the infinite war?