Hand grenade

A grenade is a small bomb typically thrown by hand.

A variety of hand grenades exist, the most common being explosive grenades designed to detonate after impact or after a set amount of time.

Grenadiers were originally soldiers who specialized in throwing grenades.

The word "grenade" derives from the French word for a "small explosive shell". Its first use in English dates from the 1590s. It is likely derived from Old French pomegranate (influenced by Spanish granada), so called because the many-seeded fruit suggested the powder-filled, fragmenting bomb, or from similarity of shape.

Rudimentary incendiary grenades appeared in the Eastern Roman (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. The use of Greek fire spread to Muslim armies in the Near East, from where it reached China by the 10th century.

In China, during the Song Dynasty (960–1279AD), weapons known as Zhen Tian Lei (震天雷, "Sky-shaking Thunder") were created when Chinese soldiers packed gunpowder into ceramic or metal containers. In 1044, a military book Wujing Zongyao ("Compilation of Military Classics") described various gunpowder recipes in which one can find, according to Joseph Needham, the prototype of the modern hand grenade. The Chinese also discovered the explosive potential of packing hollowed cannonball shells with gunpowder. The mid-14th-century book, Huolongjing (火龍經, "Fire Dragon Manual"), written by Jiao Yu (焦玉), recorded an earlier Song-era cast iron cannon known as the "flying-cloud thunderclap cannon" (飛雲霹靂炮; feiyun pili pao). The manuscript stated that (Needham's modified Wade-Giles spelling):

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