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Grapeshot is a type of anti-personnel ammunition used in cannons. Instead of solid shot, a mass of loosely packed metal slugs is loaded into a canvas bag. Grapeshot can also be improvised from chainlinks, shards of glass, rocks, etc. The balls assembled resemble a cluster of grapes (hence the name). On firing, the balls spread out from the muzzle at high velocity, giving an effect similar to a shotgun but scaled up to cannon size. Upon impact with a person, debris could go flying and become secondary projectiles. This effect was especially devastating against densely massed troops, where high-velocity bone fragments could greatly magnify the number of casualties.
Cannons would fire solid shot to attack enemy artillery and troops at longer range (although the Shrapnel round was invented to increase the effect of grape shot at a distance), and switch to grape when they or nearby troops were charged.
Conflicts in which grapeshot was famously and effectively used include:
Since the passing of muzzle loaded cannon, and the introduction of the fixed round, grape has been replaced by canister or case round, where a brass cartridge contains the shot.