During the Civil War, the south was low in gunpowder ingredients. One of the components was nitre which can be distilled from urine. Wagons would roll through towns in places like New Orleans and collect urine from women's chamberpots. It would be distilled into nitre and voila the south could shoot a few more bullets. Some chamber pots actually had engravings of Union generals (Burnside comes to mind) in the bottom.
ollie