The Corps of Discovery used an air rifle to keep the peace.
Below is the air rifle that Lewis and Clark took on their expedition and AMAZED the Indians!
It took 1500 strokes to pump this rifle to full pressure, after which it could quietly shoot more than 400 .46 cal. round balls, each of which could blast a clean hole through a 1-inch pine board at 100 yards.
Lewis and Clark put on shooting demonstrations for the Indians they encountered. The natives never knew how many air rifles the corps had, so the guns managed to keep the peace throughout the trip to and from the Pacific.