When the press describes as a "huge, fierce" battle wounds two or three soldiers, we know something is wrong with our sense of scale. This doesn't mean that we can't say infer real facts about the size of the resistance in Iraq. If we know the number of dead Iraqi insurgents, we can calculate at least the largest possible number of people fighting against the US. The lowest percentage of dead in conventional, modern wars is one dead for every sixteen fighters. This was the percentage of US dead in WW1, WWII, and Korean.