With no triggered traps in 2 days and a total mouse-skull count of 15 I removed the traps and thought the mouse problem had disappeared.  Later that day while craving cereal I saw the mice had returned and were eating my Raisin Nut Bran.  I replaced the traps and the death count is up to 18.  I fear the rodents and my family may be beginning some primitive form of trench warfare.