The Minié Ball is a type of muzzle-loading rifle bullet that was developed in the mid-19th century. It features a conical shape with a hollow base, allowing it to expand upon firing. This design improved accuracy and range compared to earlier round balls, making it a significant advancement in firearm technology. The Minié Ball was widely used during the American Civil War and other conflicts of the time. Its effectiveness contributed to the high casualty rates in battles, as it could penetrate armor and cause severe injuries. The bullet is named after its inventor, Claude-Étienne Minié, a French army officer.