Canister shot is a kind of anti-personnel ammunition used in cannons. It was similar to case and the naval grapeshot, but fired smaller and more numerous balls, which did not have to punch through the wooden hull of a ship. Canister shot has been used since the advent of gunpowder-firing artillery in Western armies; however, canister (or case) shot saw particularly frequent use on land and at sea in the various wars of the 18th and 19th century. The canister round is similar to a case (hence the confusion between case shot and canister shot) and is still used today in modern artillery, particularly in the main armament of tanks with smoothbore cannons.