in the medieval period are: Artillery Cataphract Condottieri Fyrd Rashidun Mobile guard Mamluk Janissary Knight (see also: Chivalry) Crossbow Pikeman Samurai Sipahi Trebuchet Bows and arrows were often used by combatants. Egyptians shot arrows from chariots effectively. The crossbow was developed around 500 BC in China, and was used heavily in the Middle Ages. The English/Welsh longbow from the 12th century also became important in the Middle Ages. It helped to give the English a large early advantage in the Hundred Years' War, even though the English were eventually defeated. The Battle of Crécy and the Battle of Agincourt are excellent examples of how to destroy an enemy using a longbow. It dominated battlefields for over a century. Gunpowder There is evidence for gunpowder evolving slowly from formulations by Chinese alchemists as early as the 4th century, at first as experiments for life force and metal transmutation, and later experiments as pyrotechnics and incendiaries. By the 10th century, the developments in gunpowder led to many new weapons that were improved over time. The Chinese used incendiary devices based on this in siege warfare against the Mongols starting in the mid 13th century. "Pots with wicks of flax or cotton were used, containing a combination of sulfur, saltpeter (potassium nitrate), aconitine, oil, resin, ground charcoal and wax." Joseph Needham argued the Chinese were able to destroy buildings and walls using such devices. Such experimentation was not present in Western Europe, where the combination of saltpeter, sulfur and charcoal were used exclusively for explosives and as a propellant in firearms. What the Chinese often referred to as the "fire drug" arrived in Europe, fully fleshed out, as gunpowder. Cannons were first used in Europe in the early 14th century, and played a vital role in the Hundred Years' War. The first cannons were simply welded metal bars in the form of a cylinder, and the first cannonballs were made of stone. By 1346, at the Battle of Crécy, the cannon had been used; at the Battle of Agincourt they would be used again. The first infantry firearms, from fire lances to hand cannons, were held in one hand, while the explosive charge was ignited by a lit match or hot coal held in the other hand. In the mid-15th century came the matchlock, allowing the gun to be aimed and fired while held steady with both hands, as used in the arquebus.