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A Grape Shot was a type of ammunition that was used in cannons during the Civil War. This ammunition was a lot of loosly packed objects (like metal slugs, chain links, pieces of broken glass, rocks, and other things) unlike shots which were a solid object. The name "Grapeshot" comes from the fact that the objects are packed in the form of grapes. And when fired, the objects are shot and spread apart in different directions, almost resembling a shotgun because of the high speed that the pieces are shot at. This artillery was good for short distance attacks. It is much like the Canister shot, but with other objects, instead of golfball sized steel balls.
grape shot
grape shot

Online Sources:

"Grapeshot." Wikipedia, the Free Encyclopedia. 18 May 2010. Web. 30 May 2010.
Photo Sources:

Bkwillwm. Grapeshot Treatise Closeup. Digital image. Wikipedia. 25 Feb. 2006. Web. 30 May 2010.