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Instead of a single detonation, a scatter grenade springs open and tosses 4 charges into the surrounding area, which detonate on impact within a 2 to 4 meter radius around the original target area, confounding enemy forces and causing general chaos. Scatter grenades are currently available in high explosive, fragmentation, and smoke charges and come available in both hand thrown and launcher versions.
The first grenades appeared in the Byzantine Empire, not long after the reign of Leo III (717-741). Byzantine soldiers learned that Greek fire, a Byzantine invention of the previous century, could not only be thrown by flamethrowers at the enemy, but also in stone and ceramic jars. Later, glass containers were employed. Byzantine hand grenades with Greek fire in the 10th to 12th centuries are on display in the National Museum at Athens. The use of Greek fire, or rather variants thereof, spread to Muslim armies in the Near East, from where it reached China by the 10th century.(Which is form http://en.wikipedia.org/wiki/Hand_grenade)
Some medieval petards were small enough to be employed against enemy troops and be considered as primitive hand grenades.
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