When Meriwether Lewis began shopping for supplies and firearms to take on the Corps of Discovery's journey west, his first stop was a federal arsenal. For the following twenty-nine months, from the time the Lewis and Clark expedition left Camp Dubois with a cannon salute in 1804 until it announced its return from the West Coast to St. Louis with a volley in 1806, weapons were a crucial component of the participants' tool kit. In Weapons of the...