Ambrose Everett Burnside made his mark in history as a famous battlefield commander during the American Civil War. Today, collectors of antique firearms better remember him for the handy cavalry carbine that he invented and had manufactured, a carbine that played a large part in arming Federal cavalrymen during that war. Getting the first 300 of those carbines fabricated drove Burnside into bankruptcy in 1857, and he then changed careers. The demand...