History of gunpowder
Gunpowder is the first explosive to have been developed. Popularly listed as one of the "Four Great Inventions" of China, it was invented during the late Tang dynasty (9th century) while the earliest recorded chemical formula for gunpowder dates to the Song dynasty (11th century). Knowledge of gunpowder spread rapidly throughout Asia, the Middle East and Europe, possibly as a result of the Mongol conquests during the 13th century, with written formulas for it appearing in the Middle East between 1240 and 1280 in a treatise by Hasan al-Rammah, and in Europe by 1267 in the  Opus Majus by Roger Bacon. It was employed in warfare to some effect from at least the 10th century in weapons such as fire arrows, bombs, and the fire lance before the appearance of the gun in the 13th century. While the fire lance was eventually supplanted by the gun, other gunpowder weapons such as rockets and fire arrows continued to see use in China, Korea, India, and eventually Europe. Bombs too never ceased to develop and continued to progress into the modern day as grenades, mines, and other explosive implements. Gunpowder has also been used for non-military purposes  such as fireworks for entertainment, or in explosives for mining and tunneling. The evolution of guns led to the development of large artillery pieces, popularly known as bombards, during the 15th century, pioneered by states such as the Duchy of Burgundy. Firearms came to dominate early modern warfare in Europe by the 17th century. The gradual improvement of cannons firing heavier rounds for a greater impact against fortifications led to the invention of the star fort and the bastion in the Western world, where traditional city walls and castles were no longer suitable for defense. The use of gunpowder technology  also spread throughout the Islamic world and to India, Korea, and Japan. The so-called Gunpowder Empires of the early modern period consisted of the Mughal Empire, Safavid Empire, and Ottoman Empire. The use of gunpowder in warfare during the course of the 19th century diminished due to the invention of smokeless powder. Gunpowder is often referred to today as "black powder" to distinguish it from the propellant used in contemporary firearms. Chinese beginnings. Gunpowder formula. Gunpowder was invented in China sometime during the first millennium AD. The earliest possible reference to gunpowder appeared in 142 AD during the Eastern  Han dynasty when the alchemist Wei Boyang, also known as the "father of alchemy", wrote about a substance with gunpowder-like properties. He described a mixture of three powders that would "fly and dance" violently in his "Cantong qi", otherwise known as the "Book of the Kinship of Three", a Taoist text on the subject of alchemy. Although he did not name the powders, "they were almost certainly the ingredients of gunpowder," and no other explosive known to scientists is composed of three powders. At this time, saltpeter was produced in Hanzhong, but would shift to Gansu and Sichuan later  on. Wei Boyang is considered to be a semi-legendary figure meant to represent a "collective unity", and the "Cantong qi" was probably written in stages from the Han dynasty to 450 AD. While it was almost certainly not their intention to create a weapon of war, Taoist alchemists continued to play a major role in gunpowder development due to their experiments with sulfur and saltpeter involved in searching for eternal life and ways to transmute one material into another. Historian Peter Lorge notes that despite the early association of gunpowder with Taoism, this may be a quirk of historiography  and a result of the better preservation of texts associated with Taoism, rather than being a subject limited to only Taoists. The Taoist quest for the elixir of life attracted many powerful patrons, one of whom was Emperor Wu of Han. One of the resulting alchemical experiments involved heating 10% sulfur and 75% saltpeter to transform them. The next reference to gunpowder occurred in the year 300 during the Jin dynasty (266–420). A Taoist philosopher by the name of Ge Hong wrote down the ingredients of gunpowder in his surviving works, collectively known as the "Baopuzi" ("The Master Who Embraces  Simplicity"). The "Inner Chapters" ("neipian") on Taoism contains records of his experiments to create gold with heated saltpeter, pine resin, and charcoal among other carbon materials, resulting in a purple powder and arsenic vapours. In 492, Taoist alchemists noted that saltpeter, one of the most important ingredients in gunpowder, burns with a purple flame, allowing for practical efforts at purifying the substance. During the Tang dynasty, alchemists used saltpetre in processing the "four yellow drugs" (sulfur, realgar, orpiment, arsenic trisulfide). The first confirmed reference to what can be considered gunpowder in China occurred more than three hundred years later during  the Tang dynasty, first in a formula contained in the "Taishang Shengzu Jindan Mijue" (太上聖祖金丹秘訣) in 808, and then about 50 years later in a Taoist text known as the "Zhenyuan miaodao yaolüe" (真元妙道要略). The first formula was a combination of six parts sulfur to six parts saltpeter to one part birthwort herb. The Taoist text warned against an assortment of dangerous formulas, one of which corresponds with gunpowder: "Some have heated together sulfur, realgar (arsenic disulfide), and saltpeter with honey; smoke [and flames] result, so that their hands and faces have been burnt, and even the whole house burned  down." Alchemists called this discovery fire medicine ("huoyao" 火藥), and the term has continued to refer to gunpowder in China into the present day, a reminder of its heritage as a side result in the search for longevity increasing drugs. A book published in 1185 called "Gui Dong" (The Control of Spirits) also contains a story about a Tang dynasty alchemist whose furnace exploded, but it is not known if this was caused by gunpowder. The earliest surviving chemical formula of gunpowder dates to 1044 in the form of the military manual "Wujing Zongyao", also known in English as the  Complete Essentials for the Military Classics, which contains a collection of factoids on Chinese weaponry. However the 1044 edition has since been lost and the only currently extant copy is dated to 1510 during the Ming dynasty. The "Wujing Zongyao" served as a repository of antiquated or fanciful weaponry, and this applied to gunpowder as well, suggesting that it had already been weaponized long before the invention of what would today be considered conventional firearms. These types of gunpowder weapons styles an assortment of odd names such as "flying incendiary club for subjugating demons", "caltrop fire ball", "ten-thousand fire  flying sand magic bomb", "big bees nest", "burning heaven fierce fire unstoppable bomb", "fire bricks" which released "flying swallows", "flying rats", "fire birds", and "fire oxen". Eventually they gave way and coalesced into a smaller number of dominant weapon types, notably gunpowder arrows, bombs, and guns. This was most likely because some weapons were deemed too onerous or ineffective to deploy. Fire arrows. The early gunpowder formula contained too little saltpeter (about 50%) to be explosive, but the mixture was highly flammable, and contemporary weapons reflected this in their deployment as mainly shock and incendiary weapons. One of the first , if not the first of these weapons was the fire arrow. The first possible reference to the use of fire arrows was by the Southern Wu in 904 during the siege of Yuzhang. An officer under Yang Xingmi by the name of Zheng Fan (鄭璠) ordered his troops to "shoot off a machine to let fire and burn the Longsha Gate", after which he and his troops dashed over the fire into the city and captured it, and he was promoted to Prime Minister Inspectorate for his efforts and the burns his body endured. A later account of this event  corroborated with the report and explained that "by let fire (飛火) is meant things like firebombs and fire arrows." Arrows carrying gunpowder were possibly the most applicable form of gunpowder weaponry at the time. Early gunpowder may have only produced an effective flame when exposed to oxygen, thus the rush of air around the arrow in flight would have provided a suitable catalyst for the reaction. Rockets. The first fire arrows were arrows strapped with gunpowder incendiaries but they eventually became gunpowder propelled projectiles (rockets). It's not certain when this happened. According to the "History of Song", in 969  two Song generals, Yue Yifang and Feng Jisheng (馮繼升), invented a variant fire arrow which utilized gunpowder tubes as propellants. These fire arrows were shown to the emperor in 970 when the head of a weapons manufacturing bureau sent Feng Jisheng to demonstrate the gunpowder arrow design, for which he was heavily rewarded. However Joseph Needham argues that rockets could not have existed before the 12th century, since the gunpowder formulas listed in the "Wujing Zongyao" are not suitable as rocket propellant. According to Stephen G. Haw, there is only slight evidence that rockets existed prior to 1200 and it  is more likely they were not produced or used for warfare until the latter half of the 13th century. Rockets are recorded to have been used by the Song navy in a military exercise dated to 1245. Internal-combustion rocket propulsion is mentioned in a reference to 1264, recording that the 'ground-rat,' a type of firework, had frightened the Empress-Mother Gongsheng at a feast held in her honor by her son the Emperor Lizong. In 975, the state of Wuyue sent to the Song dynasty a unit of soldiers skilled in the handling of fire arrows and in  the same year, the Song used fire arrows to destroy the fleet of Southern Tang. In 994, the Liao dynasty attacked the Song and laid siege to Zitong with 100,000 troops. They were repelled with the aid of fire arrows. In 1000 a soldier by the name of Tang Fu (唐福) also demonstrated his own designs of gunpowder arrows, gunpowder pots (a proto-bomb which spews fire), and gunpowder caltrops, for which he was richly rewarded as well. The imperial court took great interest in the progress of gunpowder developments and actively encouraged as well as disseminated military technology. For  example, in 1002 a local militia man named Shi Pu (石普) showed his own versions of fireballs and gunpowder arrows to imperial officials. They were so astounded that the emperor and court decreed that a team would be assembled to print the plans and instructions for the new designs to promulgate throughout the realm. The Song court's policy of rewarding military innovators was reported to have "brought about a great number of cases of people presenting technology and techniques" (器械法式) according to the official "History of Song". Production of gunpowder and fire arrows heavily increased in the 11th century  as the court centralized the production process, constructing large gunpowder production facilities, hiring artisans, carpenters, and tanners for the military production complex in the capital of Kaifeng. One surviving source circa 1023 lists all the artisans working in Kaifeng while another notes that in 1083 the imperial court sent 100,000 gunpowder arrows to one garrison and 250,000 to another. Evidence of gunpowder in the Liao dynasty and Western Xia is much sparser than in Song, but some evidence such as the Song decree of 1073 that all subjects were henceforth forbidden from trading sulfur and saltpeter across the Liao border , suggests that the Liao were aware of gunpowder developments to the south and coveted gunpowder ingredients of their own. Explosives. The Jurchen people of Manchuria united under Wanyan Aguda and established the Jin dynasty in 1115. Allying with the Song, they rose rapidly to the forefront of East Asian powers and defeated the Liao dynasty in a shockingly short span of time, destroying the 150-year balance of power between the Song, Liao, and Western Xia. Remnants of the Liao fled to the west and became known as the Qara Khitai, or Western Liao to the Chinese. In the east , the fragile Song-Jin alliance dissolved once the Jin saw how badly the Song army had performed against Liao forces. Realizing the weakness of Song, the Jin grew tired of waiting and captured all five of the Liao capitals themselves. They proceeded to make war on Song, initiating the Jin-Song Wars. For the first time, two major powers would have access to equally formidable gunpowder weapons. Initially the Jin expected their campaign in the south to proceed smoothly given how poorly the Song had fared against the Liao. However they were met with stout resistance upon besieging Kaifeng in  1126 and faced the usual array of gunpowder arrows and fire bombs, but also a weapon called the "thunderclap bomb" (霹靂炮), which one witness wrote, "At night the thunderclap bombs were used, hitting the lines of the enemy well, and throwing them into great confusion. Many fled, screaming in fright." The thunderclap bomb was previously mentioned in the "Wujing Zongyao", but this was the first recorded instance of its use. Its description in the text reads thus: Jin troops withdrew with a ransom of Song silk and treasure but returned several months later with their own gunpowder bombs manufactured by  captured Song artisans. According to historian Wang Zhaochun, the account of this battle provided the "earliest truly detailed descriptions of the use of gunpowder weapons in warfare." Records show that the Jin utilized gunpowder arrows and trebuchets to hurl gunpowder bombs while the Song responded with gunpowder arrows, fire bombs, thunderclap bombs, and a new addition called the "molten metal bomb" (金汁炮). As the Jin account describes, when they attacked the city's Xuanhua Gate, their "fire bombs fell like rain, and their arrows were so numerous as to be uncountable." The Jin captured Kaifeng despite the appearance of the  molten metal bomb and secured another 20,000 fire arrows for their arsenal. The molten metal bomb appeared again in 1129 when Song general Li Yanxian (李彥仙) clashed with Jin forces while defending a strategic pass. The Jin assault lasted day and night without respite, using siege carts, fire carts, and sky bridges, but each assault was met with Song soldiers who "resisted at each occasion, and also used molten metal bombs. Wherever the gunpowder touched, everything would disintegrate without a trace." Fire lance. The Song relocated their capital to Hangzhou and the Jin followed. The fighting that ensued would see  the first proto-gun, the fire lance, in action – with earliest confirmed employment by Song dynasty forces against the Jin in 1132 during the siege of De'an (modern Anlu, Hubei Province), Most Chinese scholars reject the appearance of the fire lance prior to the Jin-Song wars, but its first appearance in art with from Dunhuang dates to the Five Dynasties and Ten Kingdoms period in the mid-10th century. The siege of De'an marks an important transition and landmark in the history of gunpowder weapons as the fire medicine of the fire lances were described using a new word: "fire  bomb medicine" (火炮藥), rather than simply "fire medicine." This could imply the use of a new more potent formula, or simply an acknowledgement of the specialized military application of gunpowder. Peter Lorge suggests that this "bomb powder" may have been corned, making it distinct from normal gunpowder. Evidence of gunpowder firecrackers also points to their appearance at roughly around the same time fire medicine was making its transition in the literary imagination. Fire lances continued to be used as anti-personnel weapons into the Ming dynasty, and were even attached to battle carts on one situation in 1163. Song commander  Wei Sheng constructed several hundred of these carts known as "at-your-desire-war-carts" (如意戰車), which contained fire lances protruding from protective covering on the sides. They were used to defend mobile trebuchets that hurled fire bombs. They were used as cavalry weapons by the 13th century. Naval bombs. Gunpowder technology also spread to naval warfare and in 1129 Song decreed that all warships were to be fitted with trebuchets for hurling gunpowder bombs. Older gunpowder weapons such as fire arrows were also utilized. In 1159 a Song fleet of 120 ships caught a Jin fleet at anchor near  Shijiu Island (石臼島) off the shore of Shandong peninsula. The Song commander "ordered that gunpowder arrows be shot from all sides, and wherever they struck, flames and smoke rose up in swirls, setting fire to several hundred vessels." Song forces took another victory in 1161 when Song paddle boats ambushed a Jin transport fleet, launched thunderclap bombs, and drowned the Jin force in the Yangtze. According to a minor military official by the name of Zhao Wannian (趙萬年), thunderclap bombs were used again to great effect by the Song during the Jin siege of Xiangyang in 1206–1207. Both sides had  gunpowder weapons, but the Jin troops only used gunpowder arrows for destroying the city's moored vessels. The Song used fire arrows, fire bombs, and thunderclap bombs. Fire arrows and bombs were used to destroy Jin trebuchets. The thunderclap bombs were used on Jin soldiers themselves, causing foot soldiers and horsemen to panic and retreat. "We beat our drums and yelled from atop the city wall, and simultaneously fired our thunderclap missiles out from the city walls. The enemy cavalry was terrified and ran away." The Jin were forced to retreat and make camp by the riverside. In a rare  occurrence, the Song made a successful offensive on Jin forces and conducted a night assault using boats. They were loaded with gunpowder arrows, thunderclap bombs, a thousand crossbowmen, five hundred infantry, and a hundred drummers. Jin troops were surprised in their encampment while asleep by loud drumming, followed by an onslaught of crossbow bolts, and then thunderclap bombs, which caused a panic of such magnitude that they were unable to even saddle themselves and trampled over each other trying to get away. Two to three thousand Jin troops were slaughtered along with eight to nine hundred horses. Hard-shell explosives . The introduction of the iron bomb was significant to the history of gunpowder weaponry. Traditionally the inspiration for the development of the iron bomb is ascribed to the tale of a fox hunter named Iron Li. According to the story, around the year 1189 Iron Li developed a new method for hunting foxes which used a ceramic explosive to scare foxes into his nets. The explosive consisted of a ceramic bottle with a mouth, stuffed with gunpowder, and attached with a fuse. Explosive and net were placed at strategic points of places such as watering holes frequented by foxes, and  when they got near enough, Iron Li would light the fuse, causing the ceramic bottle to explode and scaring the frightened foxes right into his nets. While a fanciful tale, it's not exactly certain why this would cause the development of the iron bomb, given the explosive was made using ceramics, and other materials such as bamboo or even leather would have done the same job, assuming they made a loud enough noise. Nonetheless, the iron bomb made its first appearance in 1221 at the siege of Qizhou (in modern Hubei province), and this time it would be the  Jin who possessed the technological advantage. The Song commander Zhao Yurong (趙與褣) survived and was able to relay his account for posterity. Qizhou was a major fortress city situated near the Yangtze and a 25 thousand strong Jin army advanced on it in 1221. News of the approaching army reached Zhao Yurong in Qizhou, and despite being outnumbered nearly eight to one, he decided to hold the city. Qizhou's arsenal consisted of some three thousand thunderclap bombs, twenty thousand "great leather bombs" (皮大炮), and thousands of gunpowder arrows and gunpowder crossbow bolts. While the formula for gunpowder had become  potent enough to consider the Song bombs to be true explosives, they were unable to match the explosive power of the Jin iron bombs. Yurong describes the uneven exchange thus, "The barbaric enemy attacked the Northwest Tower with an unceasing flow of catapult projectiles from thirteen catapults. Each catapult shot was followed by an iron fire bomb [catapult shot], whose sound was like thunder. That day, the city soldiers in facing the catapult shots showed great courage as they maneuvered [our own] catapults, hindered by injuries from the iron fire bombs. Their heads, their eyes, their cheeks were exploded to  bits, and only one half [of the face] was left." Jin artillerists were able to successfully target the command center itself: "The enemy fired off catapult stones ... nonstop day and night, and the magistrate's headquarters [帳] at the eastern gate, as well as my own quarters ..., were hit by the most iron fire bombs, to the point that they struck even on top of [my] sleeping quarters and [I] nearly perished! Some said there was a traitor. If not, how would they have known the way to strike at both of these places?" Zhao was able to examine the  new iron bombs himself and described thus, "In shape they are like gourds, but with a small mouth. They are made with pig iron, about two inches thick, and they cause the city's walls to shake." Houses were blown apart, towers battered, and defenders blasted from their placements. Within four weeks all four gates were under heavy bombardment. Finally the Jin made a frontal assault on the walls and scaled them, after which followed a merciless hunt for soldiers, officers, and officials of every level. Zhao managed an escape by clambering over the battlement and making a hasty retreat  across the river, but his family remained in the city. Upon returning at a later date to search the ruins, he found that the "bones and skeletons were so mixed up that there was no way to tell who was who." Hand cannon. The early fire lance, considered to be the ancestor of firearms, is not considered a true gun because it did not include projectiles, whereas a gun by definition uses "the explosive force of the gunpowder to propel a projectile from a tube: cannons, muskets, and pistols are typical examples.". Even later on when shrapnel such as ceramics  and bits of iron were added to the fire lance, these didn't occlude the barrel, and were only swept along with the discharge rather than making use of windage, and so are referred to as "co-viatives." In 1259 a type of "fire-emitting lance" ("tuhuoqiang" 突火槍) made an appearance and according to the "History of Song": "It is made from a large bamboo tube, and inside is stuffed a pellet wad (子窠). Once the fire goes off it completely spews the rear pellet wad forth, and the sound is like a bomb that can be heard for five  hundred or more paces." The pellet wad mentioned is possibly the first true bullet in recorded history depending on how bullet is defined, as it did occlude the barrel, unlike previous co-viatives used in the fire lance. Fire lances transformed from the "bamboo- (or wood- or paper-) barreled firearm to the metal-barreled firearm" to better withstand the explosive pressure of gunpowder. From there it branched off into several different gunpowder weapons known as "eruptors" in the late 12th and early 13th centuries, with different functions such as the "filling-the-sky erupting tube" which spewed out poisonous gas  and porcelain shards, the "orifice-penetrating flying sand magic mist tube" (鑽穴飛砂神霧筒) which spewed forth sand and poisonous chemicals into orifices, and the more conventional "phalanx-charging fire gourd" which shot out lead pellets. The earliest artistic depiction of what might be a hand cannon – a rock sculpture found among the Dazu Rock Carvings – is dated to 1128, much earlier than any recorded or precisely dated archaeological samples, so it is possible that the concept of a cannon-like firearm has existed since the 12th century. This has been challenged by others such as Liu Xu, Cheng Dong, and Benjamin  Avichai Katz Sinvany. According to Liu, the weight of the cannon would have been too much for one person to hold, especially with just one arm, and points out that fire lances were being used a decade later at De'an. Cheng Dong believes that the figure depicted is actually a wind spirit letting air out of a bag rather than a cannon emitting a blast. Stephen Haw also considered the possibility that the item in question was a bag of air but concludes that it is a cannon because it was grouped with other weapon wielding sculptures. Sinvany believes in  the wind bag interpretation and that the cannonball indentation was added later on. Archaeological samples of the gun, specifically the hand cannon (huochong), have been dated starting from the 13th century. The oldest extant gun whose dating is unequivocal is the Xanadu Gun because it contains an inscription describing its date of manufacture corresponding to 1298. It is so called because it was discovered in the ruins of Xanadu, the Mongol summer palace in Inner Mongolia. The Xanadu Gun is 34.7 cm in length and weighs 6.2 kg. The design of the gun includes axial holes in its rear which  some speculate could have been used in a mounting mechanism. Like most early guns it is small, weighing just over six kilograms and thirty-five centimeters in length. Although the Xanadu Gun is the most precisely dated gun from the 13th century, other extant samples with approximate dating likely predate it. The Heilongjiang hand cannon is dated a decade earlier to 1288, but the dating method is based on contextual evidence; the gun bears no inscription or era date. According to the "History of Yuan", in 1287, a group of soldiers equipped with hand cannons led by the Jurchen commander  Li Ting () attacked the rebel prince Nayan's camp. The "History" reports that the hand cannons not only "caused great damage," but also caused "such confusion that the enemy soldiers attacked and killed each other." The hand cannons were used again in the beginning of 1288. Li Ting's "gun-soldiers" or "chongzu" () were able to carry the hand cannons "on their backs". The passage on the 1288 battle is also the first to coin the name "chong" () for metal-barrel firearms. "Chong" was used instead of the earlier and more ambiguous term "huo tong" (fire tube; ), which may refer  to the tubes of fire lances, proto-cannons, or signal flares. Another specimen, the Wuwei Bronze Cannon, was discovered in 1980 and may possibly be the oldest as well as largest cannon of the 13th century: a 100 centimeter 108 kilogram bronze cannon discovered in a cellar in Wuwei, Gansu Province containing no inscription, but has been dated by historians to the late Western Xia period between 1214 and 1227. The gun contained an iron ball about nine centimeters in diameter, which is smaller than the muzzle diameter at twelve centimeters, and 0.1 kilograms of gunpowder in it when discovered , meaning that the projectile might have been another co-viative. Ben Sinvany and Dang Shoushan believe that the ball used to be much larger prior to its highly corroded state at the time of discovery. While large in size, the weapon is noticeably more primitive than later Yuan dynasty guns, and is unevenly cast. A similar weapon was discovered not far from the discovery site in 1997, but much smaller in size at only 1.5 kg. Chen Bingying disputes this however, and argues there were no guns before 1259, while Dang Shoushan believes the Western Xia guns point to the  appearance of guns by 1220, and Stephen Haw goes even further by stating that guns were developed as early as 1200. Sinologist Joseph Needham and renaissance siege expert Thomas Arnold provide a more conservative estimate of around 1280 for the appearance of the "true" cannon. Whether or not any of these are correct, it seems likely that the gun was born sometime during the 13th century. Use by the Mongols. The Mongols and their rise in world history as well as conflicts with both the Jin and Song played a key role in the evolution of gunpowder technology. Mongol aptitude  in incorporating foreign experts extended to the Chinese, who provided artisans that followed Mongol armies willingly and unwillingly far into the west and even east, to Japan. Unfortunately textual evidence for this is scant as the Mongols left few documents. This lack of primary source documents has caused some historians and scholars such as Kate Raphael to doubt the Mongol's role in disseminating gunpowder throughout Eurasia. On the opposite side stand historians such as Tonio Andrade and Stephen Haw, who believe that the Mongol Empire not only used gunpowder weapons but deserves the moniker "the first gunpowder empire." Conquest  of the Jin dynasty. The first concerted Mongol invasion of Jin occurred in 1211 and total conquest was not accomplished until 1234. In 1232 the Mongols besieged the Jin capital of Kaifeng and deployed gunpowder weapons along with other more conventional siege techniques such as building stockades, watchtowers, trenches, guardhouses, and forcing Chinese captives to haul supplies and fill moats. Jin scholar Liu Qi (劉祈) recounts in his memoir, "the attack against the city walls grew increasingly intense, and bombs rained down as [the enemy] advanced." The Jin defenders also deployed gunpowder bombs as well as fire arrows ("huo jian  火箭) launched using a type of early solid-propellant rocket. Of the bombs, Liu Qi writes, From within the walls the defenders responded with a gunpowder bomb called the heaven-shaking-thunder bomb (震天雷). Whenever the [Mongol] troops encountered one, several men at a time would be turned into ashes." A more fact based and clear description of the bomb exists in the "History of Jin": "The heaven-shaking-thunder bomb is an iron vessel filled with gunpowder. When lighted with fire and shot off, it goes off like a crash of thunder that can be heard for a hundred  li [thirty miles], burning an expanse of land more than half a mu [所爇圍半畝之上, a mu is a sixth of an acre], and the fire can even penetrate iron armor." A Ming official named He Mengchuan would encounter an old cache of these bombs three centuries later in the Xi'an area: "When I went on official business to Shaanxi Province, I saw on top of Xi'an's city walls an old stockpile of iron bombs. They were called 'heaven-shaking-thunder' bombs, and they were like an enclosed rice bowl with a hole at the top, just big enough to  put your finger in. The troops said they hadn't been used for a very long time." Furthermore, he wrote, "When the powder goes off, the bomb rips open, and the iron pieces fly in all directions. That is how it is able to kill people and horses from far away." Heaven-shaking-thunder bombs, also known as thunder crash bombs, were utilized prior to the siege in 1231 when a Jin general made use of them in destroying a Mongol warship, but during the siege the Mongols responded by protecting themselves with elaborate screens of thick cowhide. This was  effective enough for workers to get right up to the walls to undermine their foundations and excavate protective niches. Jin defenders countered by tying iron cords and attaching them to heaven-shaking-thunder bombs, which were lowered down the walls until they reached the place where the miners worked. The protective leather screens were unable to withstand the explosion, and were penetrated, killing the excavators. Another weapon the Jin employed was an improved version of the fire lance called the flying fire lance. The "History of Jin" provides a detailed description: "To make the lance, use chi-huang paper, sixteen  layers of it for the tube, and make it a bit longer than two feet. Stuff it with willow charcoal, iron fragments, magnet ends, sulfur, white arsenic [probably an error that should mean saltpeter], and other ingredients, and put a fuse to the end. Each troop has hanging on him a little iron pot to keep fire [probably hot coals], and when it's time to do battle, the flames shoot out the front of the lance more than ten feet, and when the gunpowder is depleted, the tube isn't destroyed." While Mongol soldiers typically held a view of  disdain toward most Jin weapons, apparently they greatly feared the flying fire lance and heaven-shaking-thunder bomb. Kaifeng managed to hold out for a year before the Jin emperor fled and the city capitulated. In some cases Jin troops still fought with some success, scoring isolated victories such as when a Jin commander led 450 fire lancers against a Mongol encampment, which was "completely routed, and three thousand five hundred were drowned." Even after the Jin emperor committed suicide in 1234, one loyalist gathered all the metal he could find in the city he was defending, even gold and  silver, and made explosives to lob against the Mongols, but the momentum of the Mongol Empire could not be stopped. By 1234, both the Western Xia and Jin dynasty had been conquered. Conquest of the Song dynasty. The Mongol war machine moved south and in 1237 attacked the Song city of Anfeng (modern Shouxian, Anhui Province) "using gunpowder bombs [huo pao] to burn the [defensive] towers." These bombs were apparently quite large. "Several hundred men hurled one bomb, and if it hit the tower it would immediately smash it to pieces." The Song defenders under commander Du Gao (杜杲) rebuilt  the towers and retaliated with their own bombs, which they called the "Elipao," after a famous local pear, probably in reference to the shape of the weapon. Perhaps as another point of military interest, the account of this battle also mentions that the Anfeng defenders were equipped with a type of small arrow to shoot through eye slits of Mongol armor, as normal arrows were too thick to penetrate. By the mid 13th century, gunpowder weapons had become central to the Song war effort. In 1257 the Song official Li Zengbo was dispatched to inspect frontier city arsenals. Li considered  an ideal city arsenal to include several hundred thousand iron bombshells, and also its own production facility to produce at least a couple thousand a month. The results of his tour of the border were severely disappointing and in one arsenal he found "no more than 85 iron bomb-shells, large and small, 95 fire-arrows, and 105 fire-lances. This is not sufficient for a mere hundred men, let alone a thousand, to use against an attack by the ... barbarians. The government supposedly wants to make preparations for the defense of its fortified cities, and to furnish them with  military supplies against the enemy (yet this is all they give us). What chilling indifference!" Fortunately for the Song, Möngke Khan died in 1259 and the war would not continue until 1269 under the leadership of Kublai Khan, but when it did the Mongols came in full force. Blocking the Mongols' passage south of the Yangtze were the twin fortress cities of Xiangyang and Fancheng. What resulted was one of the longest sieges the world had ever known, lasting from 1268 to 1273. In 1273 the Mongols enlisted the expertise of two Muslim engineers, one from Persia and one from  Syria, who helped in the construction of counterweight trebuchets. These new siege weapons had the capability of throwing larger missiles further than the previous traction trebuchets. One account records, "when the machinery went off the noise shook heaven and earth; every thing that [the missile] hit was broken and destroyed." The fortress city of Xiangyang fell in 1273. The next major battle to feature gunpowder weapons was during a campaign led by the Mongol general Bayan, who commanded an army of around two hundred thousand, consisting of mostly Chinese soldiers. It was probably the largest army the Mongols had ever  utilized. Such an army was still unable to successfully storm Song city walls, as seen in the 1274 Siege of Shayang. Thus Bayan waited for the wind to change to a northerly course before ordering his artillerists to begin bombarding the city with molten metal bombs, which caused such a fire that "the buildings were burned up and the smoke and flames rose up to heaven." Shayang was captured and its inhabitants massacred. Gunpowder bombs were used again in the 1275 Siege of Changzhou in the latter stages of the Mongol-Song Wars. Upon arriving at the city, Bayan gave  the inhabitants an ultimatum: "if you ... resist us ... we shall drain your carcasses of blood and use them for pillows." This didn't work and the city resisted anyway, so the Mongol army bombarded them with fire bombs before storming the walls, after which followed an immense slaughter claiming the lives of a quarter million. The war lasted for only another four years during which some remnants of the Song held up last desperate defenses. In 1277, 250 defenders under Lou Qianxia conducted a suicide bombing and set off a huge iron bomb when it became clear defeat was imminent . Of this, the "History of Song" writes, "the noise was like a tremendous thunderclap, shaking the walls and ground, and the smoke filled up the heavens outside. Many of the troops [outside] were startled to death. When the fire was extinguished they went in to see. There were just ashes, not a trace left." So came an end to the Mongol-Song Wars, which saw the deployment of all the gunpowder weapons available to both sides at the time, which for the most part meant gunpowder arrows, bombs, and lances, but in retrospect, another development would overshadow them all, the  birth of the gun. In 1280, a large store of gunpowder at Weiyang in Yangzhou accidentally caught fire, producing such a massive explosion that a team of inspectors at the site a week later deduced that some 100 guards had been killed instantly, with wooden beams and pillars blown sky high and landing at a distance of over 10 li (~2 mi. or ~3 km) away from the explosion, creating a crater more than ten feet deep. By the time of Jiao Yu and his "Huolongjing" (a book that describes military applications of gunpowder in great detail) in the mid  14th century, the explosive potential of gunpowder was perfected, as the level of nitrate in gunpowder formulas had risen from a range of 12% to 91%, with at least 6 different formulas in use that are considered to have maximum explosive potential for gunpowder. By that time, the Chinese had discovered how to create explosive round shot by packing their hollow shells with this nitrate-enhanced gunpowder. Invasions of Europe and Japan. Gunpowder may have been used during the Mongol invasions of Europe. "Fire catapults", ""pao"", and "naphtha-shooters" are mentioned in some sources. However, according to Timothy May, "there  is no concrete evidence that the Mongols used gunpowder weapons on a regular basis outside of China." Shortly after the Mongol invasions of Japan (1274–1281), the Japanese produced a scroll painting depicting a bomb. Called tetsuhau in Japanese, the bomb is speculated to have been the Chinese thunder crash bomb. Japanese descriptions of the invasions also talk of iron and bamboo "pao" causing "light and fire" and emitting 2–3,000 iron bullets. The "Nihon Kokujokushi", written around 1300, mentions "huo tong" (fire tubes) at the Battle of Tsushima in 1274 and the second coastal assault led by Holdon in 1281. The  Hachiman Gudoukun of 1360 mentions iron "pao" "which caused a flash of light and a loud noise when fired." The "Taiheki" of 1370 mentions "iron "pao" shaped like a bell." Historiography of gunpowder and gun transmission. According to historian Tonio Andrade, "Scholars today overwhelmingly concur that the gun was invented in China," however multiple independent gunpowder and gun invention theories continue to exist today, advocating for European, Islamic, or Indian origins. Opponents of Chinese invention and transmission criticize the vagueness of Chinese records on specific gunpowder usage in weaponry, the possible lack of gunpowder in incendiary weapons as described by  Chinese documents, the weakness of Chinese firearms, the lack of evidence of guns between Europe and China before 1326, and emphasize the appearance of earlier or superior gunpowder weapons. For example, Stephen Morillo, Jeremy Black, and Paul Lococo's "War in World History" argues that "the sources are not entirely clear about Chinese use of gunpowder in guns. There are references to bamboo and iron cannons, or perhaps proto-cannons, but these seem to have been small, unreliable, handheld weapons in this period. The Chinese do seem to have invented guns independently of the Europeans, at least in principle; but , in terms of effective cannon, the edge goes to Europe." Independent invention theories include examples such as the attribution of gunpowder to Berthold Schwarz (Black Berthold), the usage of cannons by Mamluks at the Battle of Ain Jalut in 1260, and descriptions of gunpowder and firearms to various Sanskrit texts. The problem with all theories of non-Chinese invention boils down to lack of evidence and dating. It's not certain who exactly Berthold Schwarz was since there are no contemporary records of him. According to J.R. Partington, Black Berthold is a purely legendary figure invented for the purpose of  providing a German origin for gunpowder and cannon. The source for Mamluk usage of cannons in the Battle of Ain Jalut is a text dated to the late 14th century. The dating of the cited Sanskrit texts is often dubious at best, with one example, "Sukraniti", containing descriptions of a musket and a cart-drawn gun. Proponents of Chinese invention and transmission point out the acute dearth of any significant evidence of evolution or experimentation with gunpowder or gunpowder weapons leading up to the gun outside of China. Gunpowder appeared in Europe primed for military usage as an explosive and  propellant, bypassing a process which took centuries of Chinese experimentation with gunpowder weaponry to reach, making a nearly instantaneous and seamless transition into firearm warfare, as its name suggests. Furthermore, early European gunpowder recipes shared identical defects with Chinese recipes such as the inclusion of the poisons sal ammoniac and arsenic, which provide no benefit to gunpowder. Bert S. Hall explains this phenomenon in his "Weapons and Warfare in Renaissance Europe: Gunpowder, Technology, and Tactics" by drawing upon the gunpowder transmission theory, explaining that "gunpowder came [to Europe], not as an ancient mystery, but as a well-developed modern technology , in a manner very much like twentieth-century 'technology-transfer' projects." In a similar vein, Peter Lorge supposes that the Europeans experienced gunpowder "free from preconceived notions of what could be done," in contrast to China, "where a wide range of formulas and a broad variety of weapons demonstrated the full range of possibilities and limitations of the technologies involved." There is also the vestige of Chinese influence on Muslim terminology of key gunpowder related items such as saltpeter, which has been described as either Chinese snow or salt, fireworks which were called Chinese flowers, and rockets which were called  Chinese arrows. Moreover, Europeans in particular experienced great difficulty in obtaining saltpeter, a primary ingredient of gunpowder which was relatively scarce in Europe compared to China, and had to be obtained from "distant lands or extracted at high cost from soil rich in dung and urine." Thomas Arnold believes that the similarities between early European cannons and contemporary Chinese models suggests a direct transmission of cannon making knowledge from China rather than a home grown development. Spread throughout Eurasia and Africa. Middle East. The Muslim world acquired the gunpowder formula some time after 1240, but before 1280, by which time  Hasan al-Rammah had written, in Arabic, recipes for gunpowder, instructions for the purification of saltpeter, and descriptions of gunpowder incendiaries. Gunpowder arrived in the Middle East from China. This is implied by al-Rammah's usage of "terms that suggested he derived his knowledge from Chinese sources" and his reference to saltpeter as "Chinese snow" , fireworks as "Chinese flowers" and rockets as "Chinese arrows". Similarly, the Persians called saltpeter "Chinese salt" or "salt from Chinese salt marshes" ( ). It is sometimes suggested that it was invading Mongols who introduced gunpowder to the Islamic world. Hasan al-Rammah also describes the  purifying of saltpeter using the chemical processes of solution and crystallization. This was the first clear method for the purification of saltpeter. The earliest torpedo was also first described in 1270 by Hasan al-Rammah in "The Book of Military Horsemanship and Ingenious War Devices", which illustrated a torpedo running with a rocket system filled with explosive materials and having three firing points. The earliest surviving documentary evidence for the use of the hand cannon in the Islamic world are from several Arabic manuscripts dated to the 14th century. According to Paul E. J. Hammer, the Mamluks certainly used cannons  by 1342. Europe. A common theory of how gunpowder came to Europe is that it made its way along the Silk Road through the Middle East. Another is that it was brought to Europe during the Mongol invasion in the first half of the 13th century. Some sources claim that Chinese firearms and gunpowder weapons may have been deployed by Mongols against European forces at the Battle of Mohi in 1241. It may also have been due to subsequent diplomatic and military contacts. Some authors have speculated that William of Rubruck, who served as an ambassador to the Mongols from  1253 to 1255, was a possible intermediary in the transmission of gunpowder. His travels were recorded by Roger Bacon, who was the first European to mention gunpowder, but the records of William's journey do not contain any mention of gunpowder. The earliest European references to gunpowder are found in Roger Bacon's "Opus Majus" from 1267, in which he mentions a firecracker toy found in various parts of the world. The passage reads: "We have an example of these things (that act on the senses) in [the sound and fire of] that children's toy which is made in  many [diverse] parts of the world; i.e., a device no bigger than one's thumb. From the violence of that salt called saltpeter [together with sulfur and willow charcoal, combined into a powder] so horrible a sound is made by the bursting of a thing so small, no more than a bit of parchment [containing it], that we find [the ear assaulted by a noise] exceeding the roar of strong thunder, and a flash brighter than the most brilliant lightning." In the early 20th century, British artillery officer Henry William Lovett Hime proposed that another work tentatively attributed to Bacon , "Epistola de Secretis Operibus Artis et Naturae, et de Nullitate Magiae" contained an encrypted formula for gunpowder. This claim has been disputed by historians of science including Lynn Thorndike, John Maxson Stillman and George Sarton and by Bacon's editor Robert Steele, both in terms of authenticity of the work, and with respect to the decryption method. In any case, the formula claimed to have been decrypted (7:5:5 saltpeter:charcoal:sulfur) is not useful for firearms use or even firecrackers, burning slowly and producing mostly smoke. However, if Bacon's recipe is taken as measurements by volume rather than weight , a far more potent and serviceable explosive powder is created suitable for firing hand-cannons, albeit less consistent due to the inherent inaccuracies of measurements by volume. One example of this composition resulted in 100 parts saltpeter, 27 parts charcoal, and 45 parts sulfur, by weight. The oldest written recipes for gunpowder in Europe were recorded under the name Marcus Graecus or Mark the Greek between 1280 and 1300 in the "Liber Ignium", or "Book of Fires". One recipe for "flying fire" ("ignis volatilis") involves saltpeter, sulfur, and colophonium, which, when inserted into a reed or hollow wood, "flies away  suddenly and burns up everything." Another recipe, for artificial "thunder", specifies a mixture of one pound native sulfur, two pounds linden or willow charcoal, and six pounds of saltpeter. Another specifies a 1:3:9 ratio. The earliest known European depiction of a gun appeared in 1326 in a manuscript by Walter de Milemete, although not necessarily drawn by him, known as "De Nobilitatibus, sapientii et prudentiis regum" (Concerning the Majesty, Wisdom, and Prudence of Kings), which displays a gun with a large arrow emerging from it and its user lowering a long stick to ignite the gun through the touchole In  the same year, another similar illustration showed a darker gun being set off by a group of knights, which also featured in another work of de Milemete's, "De secretis secretorum Aristotelis". On 11 February of that same year, the Signoria of Florence appointed two officers to obtain "canones de mettallo" and ammunition for the town's defense. In the following year a document from the Turin area recorded a certain amount was paid "for the making of a certain instrument or device made by Friar Marcello for the projection of pellets of lead." The 1320s seem to have been  the takeoff point for guns in Europe according to most modern military historians. Scholars suggest that the lack of gunpowder weapons in a well-traveled Venetian's catalogue for a new crusade in 1321 implies that guns were unknown in Europe up until this point. From the 1320s guns spread rapidly across Europe. The French raiding party that sacked and burned Southampton in 1338 brought with them a ribaudequin and 48 bolts (but only 3 pounds of gunpowder). By 1341 the town of Lille had a "tonnoire master," and a tonnoire was an arrow-hurling gun. In 1345, two iron  cannons were present in Toulouse. In 1346 Aix-la-Chapelle too possessed iron cannons which shot arrows (busa ferrea ad sagittandum tonitrum). The Battle of Crécy in 1346 was one of the first in Europe where cannons were used. By 1350 Petrarch wrote that the presence of cannons on the battlefield was 'as common and familiar as other kinds of arms'. Around the late 14th century European and Ottoman guns began to deviate in purpose and design from guns in China, changing from small anti-personnel and incendiary devices to the larger artillery pieces most people imagine today when using  the word "cannon." If the 1320s can be considered the arrival of the gun on the European scene, then the end of the 14th century may very well be the departure point from the trajectory of gun development in China. In the last quarter of the 14th century, European guns grew larger and began to blast down fortifications. Southeast Asia. In Southeast Asia, cannons were used by the Ayutthaya Kingdom in 1352 during its invasion of the Khmer Empire. Within a decade large quantities of gunpowder could be found in the Khmer Empire. By the end of the century firearms  were also used by the Trần dynasty in Đại Việt. Documentary and archeological evidence indicate that Arab traders introduced gunpowder weapons to the Javanese, Acehnese, and Batak via long established commercial trade routes around the early to mid 14th century. The Mongol invasion of Java in 1293 brought gunpowder technology to the Nusantara archipelago in the form of cannon (Chinese: "Pao"). Even though the knowledge of making gunpowder-based weapon has been known after the failed Mongol invasion of Java, and the predecessor of firearms, the pole gun (bedil tombak), was recorded as being used by Java in 1413, the  knowledge of making "true" firearms came much later, after the middle of 15th century. It was brought by the Muslim traders from West Asia, most probably the Arabs. The precise year of introduction is unknown, but it may be safely concluded to be no earlier than 1460. Portuguese influence to local weaponry, particularly after the capture of Malacca (1511), resulted in a new type of hybrid tradition matchlock firearm, the istinggar. Saltpeter harvesting was recorded by Dutch and German travelers as being common in even the smallest villages and was collected from the decomposition process of large dung hills specifically  piled for the purpose. The Dutch punishment for possession of non-permitted gunpowder appears to have been amputation. Ownership and manufacture of gunpowder was later prohibited by the colonial Dutch occupiers. According to colonel McKenzie quoted in Sir Thomas Stamford Raffles', "The History of Java" (1817), the purest sulfur was supplied from a crater from a mountain near the straits of Bali. India. Gunpowder technology is believed to have arrived in India by the mid-14th century, but could have been introduced much earlier by the Mongols, who had conquered both China and some borderlands of India, perhaps as early as  the mid-13th century. The unification of a large single Mongol Empire resulted in the free transmission of Chinese technology into Mongol conquered parts of India. Regardless, it is believed that the Mongols used Chinese gunpowder weapons during their invasions of India. It was written in the "Tarikh-i Firishta" (1606–1607) that the envoy of the Mongol ruler Hulegu Khan was presented with a dazzling pyrotechnics display upon his arrival in Delhi in 1258. The first gunpowder device, as opposed to naphtha-based pyrotechnics, introduced to India from China in the second half of the 13th century, was a rocket called  the "hawai" (also called "ban"). The rocket was used as an instrument of war from the second half of the 14th century onward, and the Delhi sultanate as well as Bahmani kingdom made good use of them. As a part of an embassy to India by Timurid leader Shah Rukh (1405–1447), 'Abd al-Razzaq mentioned naphtha-throwers mounted on elephants and a variety of pyrotechnics put on display. Roger Pauly has written that "while gunpowder was primarily a Chinese innovation," the saltpeter that led to the invention of gunpowder may have arrived from India, although it is also likely that  it originates indigenously in China. Firearms known as "top-o-tufak" also existed in the Vijayanagara Empire of India by as early as 1366 CE. In 1368–1369, the Bahmani Sultanate may have used firearms against the Vijayanagara, but these weapons could have been pyrotechnics as well. By 1442 guns had a clearly felt presence in India as attested to by historical records. From then on the employment of gunpowder warfare in India was prevalent, with events such as the siege of Belgaum in 1473 AD by the Sultan Muhammad Shah Bahmani. Muslim and Hindu states in the south were advanced  in artillery compared to the Delhi rulers of this period because of their contact with outside world, especially Turkey, through the sea route. The south Indian kingdoms imported their gunners (topci) and artillery from Turkey and the Arab countries, with whom they had developed good relations. Korea. Korea had already come into possession of cannons by 1373, when a Korean mission was sent to China requesting gunpowder supplies for the artillery on their ships. However Korea did not natively produce gunpowder until the years 1374–76. In the 14th century a Korean scholar named Choe Museon discovered a way to produce  it after visiting China and bribing a merchant by the name of Li Yuan for the gunpowder formula. In 1377 he figured out how to extract potassium nitrate from the soil and subsequently invented the juhwa, Korea's first rocket, and further developments led to the birth of singijeons, Korean arrow rockets. Korea also began producing cannons in 1377. The multiple rocket launcher known as hwacha ("fire cart" 火車) was developed from the juhwa and singijeon in Korea by 1409 during the Joseon Dynasty. Its inventors include Yi Do (이도, not to be mistaken for Sejong the Great) and Choi  Hae-san (최해산, son of Choe Museon). However the first hwachas did not fire rockets, but utilized mounted bronze guns that shot iron-fletched darts. Rocket launching hwachas were developed in 1451 under the decree of King Munjong and his younger brother Pe. ImYung (Yi Gu, 임영대군 이구). This "Munjong Hwacha" is the well-known type today, and could fire 100 rocket arrows or 200 small Chongtong bullets at one time with changeable modules. At the time, 50 units were deployed in Hanseong (present-day Seoul), and another 80 on the northern border. By the end of 1451, hundreds of  hwachas were deployed throughout Korea. Naval gunpowder weapons also appeared and were rapidly adopted by Korean ships for conflicts against Japanese pirates in 1380 and 1383. By 1410, 160 Korean ships were reported to have equipped artillery of some sort. Mortars firing thunder-crash bombs are known to have been used, and four types of cannons are mentioned: chonja (heaven), chija (earth), hyonja (black), and hwangja (yellow), but their specifications are unknown. These cannons typically shot wooden arrows tipped with iron, the longest of which were nine feet long, but stone and iron balls were sometimes used as well. Japan . Firearms seem to have been known in Japan around 1270 as proto-cannons invented in China, which the Japanese called teppō (鉄砲 lit. "iron cannon"). Gunpowder weaponry exchange between China and Japan was slow and only a small number of hand guns ever reached Japan. However Japanese samurai used Fire lances in 15th-century. The first recorded appearance of the Fire lances in Japan was in 1409. The use of gunpowder bombs in the style of Chinese explosives is known to have occurred in Japan from at least the mid-15th century onward. The first recorded appearance of the cannon in  Japan was in 1510 when a Buddhist monk presented Hōjō Ujitsuna with a teppō iron cannon that he had acquired during his travels in China. Firearms saw very little use in Japan until Portuguese matchlocks were introduced in 1543. During the Japanese invasions of Korea (1592-1598), the forces of Toyotomi Hideyoshi effectively utilized matchlock firearms against the Korean forces of Joseon, although they would ultimately be defeated and forced to withdraw from the Korean peninsula. Africa. In Africa, the Adal Empire and the Abyssinian Empire both deployed gunpowder weapons during the Adal-Abyssinian War. Imported from Arabia, and the  wider Islamic world, the Adalites, led by Ahmed ibn Ibrahim al-Ghazi, were the first African power to introduce cannon warfare to the African continent. Later on as the Portuguese Empire entered the war it would supply and train the Abyssinians with cannon and muskets, while the Ottoman Empire sent soldiers and cannon to back Adal. The conflict proved, through their use on both sides, the value of firearms such as the matchlock musket, cannon, and the arquebus over traditional weapons. Ernest Gellner in his book 'Nations and Nationalism' argues that the centralizing potential of the gun and the book , enabled both the Somali people and the Amhara people to dominate the political history of a vast area in Africa, despite neither of them being numerically predominant. "In the Horn of Africa both the Amharas and the Somalis possessed both gun and Book (not the same Book, but rival and different editions), and neither bothered greatly with the wheel. Each of these ethnic groups was aided in its use of these two pieces of cultural equipment by its link to other members of the wider religious civilization which habitually used them, and were willing to replenish their stock." – Ernest Gellner  Transition to early modern warfare. Early Ming firearms. Gun development and proliferation in China continued under the Ming dynasty. The success of its founder Zhu Yuanzhang, who declared his reign to be the era of Hongwu, or "Great Martiality," has often been attributed to his effective use of guns. Most early Ming guns weighed two to three kilograms while guns considered "large" at the time weighed around only seventy-five kilograms. Ming sources suggest guns such as these shot stones and iron balls, but were primarily used against men rather than for causing structural damage to ships or walls. Accuracy  was low and they were limited to a range of only 50 paces or so. Despite the relatively small size of early Ming guns, some elements of gunpowder weapon design followed world trends. The growing length to muzzle bore ratio matched the rate at which European guns were developing up until the 1450s. The practice of corning gunpowder had been developed by 1370 for the purpose of increasing explosive power in land mines, and was arguably used in guns as well according to one record of a fire-tube shooting a projectile 457 meters, which was probably only possible at  the time with the usage of corned powder. Around the same year Ming guns transitioned from using stone shots to iron ammunition, which has greater density and increased firearm power. Aside from firearms, the Ming pioneered in the usage of rocket launchers known as "wasp nests", which it manufactured for the army in 1380 and was used by the general Li Jinglong in 1400 against Zhu Di, the future Yongle Emperor. The peak of Chinese cannon development prior to the incorporation of European weaponry in the 16th century is exemplified by the muzzle loading wrought iron "great general cannon" (大將軍炮 ) which weighed up to 360 kilograms and could fire a 4.8 kilogram lead ball. Its heavier variant, the "great divine cannon" (大神銃), could weigh up to 600 kilograms and was capable of firing several iron balls and upward of a hundred iron shots at once. The great general and divine cannons were the last indigenous Chinese cannon designs prior to the incorporation of European models in the 16th century. The lack of larger siege weapons in China unlike the rest of the world where cannons grew larger and more potent has been attributed to the immense thickness of traditional Chinese  walls, which Tonio Andrade suggests provided no incentive for creating larger cannons, since even industrial artillery had trouble overcoming them. Asianist Kenneth Chase also argues that larger guns were not particularly useful against China's traditional enemies: horse nomads. Big guns. The development of large artillery pieces began by Burgundy. Originally a minor power, the duchy grew to become one of the most powerful states in 14th-century Europe, and a great innovator in siege warfare. The Duke of Burgundy, Philip the Bold (1363–1404), based his power on the effective use of big guns and promoted research and development in  all aspects of gunpowder weaponry technology. Philip established manufacturers and employed more cannon casters than any European power before him. Whereas most European guns before 1370 weighed about 20 to 40 lbs (9–14 kg), the French siege of Château de Saint-Sauveur-le-Vicomte in 1375 during the Hundred Years War saw the use of guns weighing over a ton (900 kg), firing stone balls weighing over 100 lbs (45 kg). Philip used large guns to help the French capture the fortress of Odruik in 1377. These guns fired projectiles far larger than any that had been used before, with  seven guns that could shoot projectiles as heavy as 90 kilograms. The cannons smashed the city walls, inaugurating a new era of artillery warfare and Burgundy's territories rapidly expanded. Europe entered an arms race to build ever larger artillery pieces. By the early 15th century both French and English armies were equipped with larger pieces known as bombards, weighing up to 5 tons (4,535 kg) and firing balls weighing up to 300 lbs (136 kg). The artillery trains used by Henry V of England in the 1415 Siege of Harfleur and 1419 Siege of Rouen proved effective in breaching  French fortifications, while artillery contributed to the victories of French forces under Joan of Arc in the Loire Campaign (1429). These weapons were transformational for European warfare. A hundred years earlier the Frenchman Pierre Dubois wrote that a "castle can hardly be taken within a year, and even if it does fall, it means more expenses for the king's purse and for his subjects than the conquest is worth," but by the 15th century European walls fell with the utmost regularity. The Ottoman Empire was also developing their own artillery pieces. Mehmed the Conqueror (1432–1481) was determined to procure  large cannons for the purpose of conquering Constantinople. Hungarian Urban produced for him a six-meter (20-foot) long cannon, which required hundreds of pounds of gunpowder to fire; during the actual siege of Constantinople the gun proved to be somewhat underwhelming. However, dozens of other large cannons bombarded Constantinople's walls in their weakest sections for 55 days, and despite a fierce defense, the city's fortifications were overwhelmed. Changes to fortifications. As a response to gunpowder artillery, European fortifications began displaying architectural principles such as lower and thicker walls in the mid-1400s. Cannon towers were built with artillery  rooms where cannons could discharge fire from slits in the walls. However this proved problematic as the slow rate of fire, reverberating concussions, and noxious fumes produced greatly hindered defenders. Gun towers also limited the size and number of cannon placements because the rooms could only be built so big. Notable surviving artillery towers include a seven layer defensive structure built in 1480 at Fougères in Brittany, and a four layer tower built in 1479 at Querfurth in Saxony. The star fort, also known as the bastion fort, "tracé à l'italienne", or renaissance fortress, was a style of fortification that  became popular in Europe during the 16th century. The bastion and star fort was developed in Italy, where the Florentine engineer Giuliano da Sangallo (1445–1516) compiled a comprehensive defensive plan using the geometric bastion and full "tracé à l'italienne" that became widespread in Europe. The main distinguishing features of the star fort were its angle bastions, each placed to support their neighbor with lethal crossfire, covering all angles, making them extremely difficult to engage with and attack. Angle bastions consisted of two faces and two flanks. Artillery positions positioned at the flanks could fire parallel into the opposite bastion's  line of fire, thus providing two lines of cover fire against an armed assault on the wall, and preventing mining parties from finding refuge. Meanwhile, artillery positioned on the bastion platform could fire frontally from the two faces, also providing overlapping fire with the opposite bastion. Overlapping mutually supporting defensive fire was the greatest advantage enjoyed by the star fort. As a result, sieges lasted longer and became more difficult affairs. By the 1530s the bastion fort had become the dominant defensive structure in Italy. Outside Europe, the star fort became an "engine of European expansion", and acted as a  force multiplier so that small European garrisons could hold out against numerically superior forces. Wherever star forts were erected the natives experienced great difficulty in uprooting European invaders. In China, Sun Yuanhua advocated for the construction of angled bastion forts in his "Xifashenji" so that their cannons could better support each other. The officials Han Yun and Han Lin noted that cannons on square forts could not support each side as well as bastion forts. Their efforts to construct bastion forts and their results were inconclusive. Ma Weicheng built two bastion forts in his home county, which helped fend off  a Qing incursion in 1638. By 1641, there were ten bastion forts in the county. Before bastion forts could be spread any further, the Ming dynasty fell in 1644, and they were largely forgotten as the Qing dynasty was on the offensive most of the time and had no use for them. Classical cannon. Gun development and design in Europe reached its "classic" form in the 1480s – longer, lighter, more efficient, and more accurate compared to its predecessors only three decades prior. The design persisted, and cannons of the 1480s show little difference and surprising similarity with cannons three centuries  later in the 1750s. This 300-year period during which the classic cannon dominated gives it its moniker. The early classical European guns are exemplified by two cannons from 1488 now preserved in a plaza in Neuchâtel, Switzerland. The Neuchâtel guns are 224 centimeters long, with a bore of 6.2 centimeters and the other is slightly longer, 252 centimeters, with the same bore size. They are differentiated from older firearms by an assortment of improvements. Their longer length-to-bore ratio imparts more energy into the shot, enabling the projectile to shoot further. Not only longer, they were also lighter  as the barrel walls were made thinner to allow for faster dissipation of heat. They also no longer needed the help of a wooden plug to load since they offered a tighter fit between projectile and barrel, further increasing the accuracy of gunpowder warfare – and were deadlier due to developments such as gunpowder corning and iron shot. When these guns reached China in the 1510s, the Chinese were highly impressed by them, primarily for their longer and thinner barrels. The two primary theories for the appearance of the classic gun involve the development of gunpowder corning and a new method  for casting guns. The corning hypothesis stipulates that the longer barrels came about as a reaction to the development of corned gunpowder. Not only did "corned" powder keep better, because of its reduced surface area, but gunners also found that it was more powerful and easier to load into guns. Prior to corning, gunpowder would also frequently demix into its constitutive components and was therefore unreliable. The faster gunpowder reaction was suitable for smaller guns, since large ones had a tendency to crack, and the more controlled reaction allowed large guns to have longer, thinner walls. However, the corning hypothesis  has been argued against on two grounds: One, the powder makers were probably more worried about spoilage than the effect of corned gunpowder on guns; and two, corning as a practice had existed in China (for explosives) since the 1370s. The second theory is that the key to developing the classic gun may have been a new method of gun casting, muzzle side up. Smith observes: "The surviving pieces of ordnance from earlier in the 15th century are big pieces with large bore sizes. They do not look like the long thin gun.… Essentially they are parallel-sided tubes with  flat ends. The explanation is, probably, that they were cast muzzle down in the traditional bell-founding method whereas the long thin guns were cast muzzle up.… Perhaps this marks the real 'revolution' in artillery. Once the technique of casting muzzle up with the attendant advantages, and it is not clear what those are at present, had been mastered by cannon founders, the way was open for the development of the 'classic' form of artillery." However, Smith himself states that it is not clear what advantages this technique would have conferred, despite its widespread adoption. Iron and bronze. Across the  15th and 16th centuries there were primarily two different types of manufactured cannons. The wrought iron cannon and the cast-bronze cannon. Wrought iron guns were structurally composed of two layers: an inner tube of iron staves held together in a tight fit by an outer case of iron hoops. Bronze cannons on the other hand were cast in one piece similar to bells. The technique used in casting bronze cannons was so similar to the bell that the two were often looked upon as a connected enterprise. Both iron and bronze cannons had their advantages and disadvantages. Forged iron  cannons were up to ten times cheaper, but more unstable due to their piece built nature. Even without use, iron cannons were liable to rust away, while bronze cannons did not. Another reason for the dominance of bronze cannons was their aesthetic appeal. Because cannons were so important as displays of power and prestige, rulers liked to commission bronze cannons, which could be sculpted into fanciful designs containing artistic motifs or symbols. It was for all these reasons that the cast-bronze cannon became the preferred type by the late 1400s. Some cannons cast in China during the 1370s may  have been of steel rather than iron. Composite metal. Composite iron/bronze cannons were far less common, but were produced in substantial numbers during the Ming and Qing dynasties. The resulting bronze-iron composite cannons were superior to iron or bronze cannons in many respects. They were lighter, stronger, longer lasting, and able to withstand more intensive explosive pressure. Chinese artisans also experimented with other variants such as cannons featuring wrought iron cores with cast iron exteriors. While inferior to their bronze-iron counterparts, these were considerably cheaper and more durable than standard iron cannons. Both types were met with  success and were considered "among the best in the world" during the 17th century. The Chinese composite metal casting technique was effective enough that Portuguese imperial officials sought to employ Chinese gunsmiths for their cannon foundries in Goa, so that they could impart their methods for Portuguese weapons manufacturing. The Gujarats experimented with the same concept in 1545, the English at least by 1580, and Hollanders in 1629. However the effort required to produce these weapons prevented them from mass production. The Europeans essentially treated them as experimental products, resulting in very few surviving pieces today. Of the currently known  extant composite metal cannons, there are 2 English, 2 Dutch, 12 Gujarati, and 48 from the Ming-Qing period. Arquebus and musket. The arquebus was a firearm that appeared in Europe and the Ottoman Empire in the early 15th century. Its name is derived from the German word "Hackenbüchse". Although the term "arquebus" was applied to many different forms of firearms from the 15th to 17th centuries, it was originally used to describe "a hand-gun with a hook-like projection or lug on its under surface, useful for steadying it against battlements or other objects when firing." These "hook  guns" were in their earliest forms defensive weapons mounted on German city walls in the early 1400s, but by the late 1400s had transitioned into handheld firearms, with heavier variants known as "muskets" that were fired from resting Y-shaped supports appearing by the early 1500s. The musket was able to penetrate all forms of armor available at the time, making armor obsolete, and as a consequence the heavy musket as well. Although there is relatively little to no difference in design between arquebus and musket except in size and strength, it was the term "musket" which remained in use  up into the 1800s. It may not be completely inaccurate to suggest that the musket was in its fabrication simply a larger arquebus. At least on one occasion the musket and arquebus have been used interchangeably to refer to the same weapon, and even referred to as an "arquebus musket." A Habsburg commander in the mid-1560s once referred to muskets as "double arquebuses." The definition of arquebus and similar firearms is therefore quite convoluted as the term has been applied to different sorts of firearms as well as acquiring several names like "hackbut," "harquebus", "schiopo," "sclopus," "tüfenk", "tofak", "matchlock", and  firelock. Some say that the hackbut was a forerunner of the arquebus. The dating of the "matchlock" firing mechanism's first appearance is disputed. The first references to the use of what may have been arquebuses ("tüfek") by the Janissary corps of the Ottoman army date them from 1394 to 1465. However it's unclear whether these were arquebuses or small cannons as late as 1444, but the fact that they were listed separate from cannons in mid-15th century inventories suggest they were handheld firearms. In Europe, a shoulder stock, probably inspired by the crossbow stock, was added to the  arquebus around 1470 and the appearance of the matchlock mechanism is dated to a little before 1475. The matchlock arquebus was the first firearm equipped with a trigger mechanism. It is also considered to be the first portable shoulder-arms firearm. Matchlock became a common term for the arquebus after it was added to the firearm. Prior to the appearance of the matchlock, handguns were fired from the chest, tucked under one arm, while the other arm maneuvered a hot pricker to the touch hole to ignite the gunpowder. The matchlock changed this by adding a firing mechanism consisting of  two parts, the match, and the lock. The lock mechanism held within a clamp a two to three feet long length of smoldering rope soaked in saltpeter, which was the match. Connected to the lock lever was a trigger, which lowered the match into a priming pan when pulled, igniting the priming powder, causing a flash to travel through the touch hole, also igniting the gunpowder within the barrel, and propelling the bullet out the muzzle. While matchlocks provided a crucial advantage by allowing the user to aim the firearm using both hands, it was also awkward to utilize. To  avoid accidentally igniting the gunpowder the match had to be detached while loading the gun. In some instances the match would also go out, so both ends of the match were kept lit. This proved cumbersome to maneuver as both hands were required to hold the match during removal, one end in each hand. The procedure was so complex that a 1607 drill manual published by Jacob de Gheyn in the Netherlands listed 28 steps just to fire and load the gun. In 1584 the Ming general Qi Jiguang composed an 11 step song to practice the procedure in rhythm : "One, clean the gun. Two pour the powder. Three tamp the powder down. Four drop the pellet. Five drive the pellet down. Six put in paper (stopper). Seven drive the paper down. Eight open the flashpan cover. Nine pour in the flash powder. Ten close the flashpan, and clamp the fuse. Eleven, listen for the signal, then open the flashpan cover. Aiming at the enemy, raise your gun and fire." Reloading a gun during the 16th century took anywhere from between 20 seconds to a minute under the most ideal conditions. The arquebus is considered to be the first portable  shoulder arms firearm. Arquebuses were used as early as 1472 by the Spanish and Portuguese at Zamora. Likewise, the Castilians used arquebuses as well in 1476. In 1496 Philip Monch of the Palatinate composed an illustrated "Buch der Strynt un(d) Buchsse(n)" on guns and "harquebuses." The Mamluks in particular were conservatively against the incorporation of gunpowder weapons. When faced with cannons and arquebuses wielded by the Ottomans they criticized them thus, "God curse the man who invented them, and God curse the man who fires on Muslims with them." Insults were also levied against the Ottomans for having "brought with  you this contrivance artfully devised by the Christians of Europe when they were incapable of meeting the Muslim armies on the battlefield." Similarly, musketeers and musket-wielding infantrymen were despised in society by the feudal knights, even until the time of "Don Quixote" author Miguel de Cervantes (1547–1616). Eventually the Mamluks under Qaitbay were ordered in 1489 to train in the use of al-bunduq al-rasas (arquebuses). However, in 1514 an Ottoman army of 12,000 soldiers wielding arquebuses still managed to rout a much larger Mamluk force. The arquebus had become a common infantry weapon by the 16th century  due to its relative cheapness – a helmet, breastplate and pike cost about three and a quarter ducats while an arquebus only a little over one ducat. Another advantage of arquebuses over other equipment and weapons was its short training period. While a bow potentially took years to master, an effective arquebusier could be trained in just two weeks. According to a 1571 report by Vincentio d'Alessandri, Persian arms including arquebuses "were superior and better tempered than those of any other nation." In the early 1500s a larger arquebus known as the musket appeared. The heavy musket, while being rather awkward  to handle, requiring a fork rest to fire properly, had the advantage of being able to penetrate the best armor within a range of 180 meters, regular armor at 365 meters, and an unarmed man at 548 meters. However, both the musket and arquebus were effectively limited to a range of only 90 to 185 meters regardless of armor since they were incredibly inaccurate. According to some sources, a smoothbore musket was completely incapable of hitting a man sized target past the 73 meter mark. While rifled guns did exist at this time in the form of grooves cut into  the interior of a barrel, these were considered specialist weapons and limited in number. In some aspects this made the smoothbore musket an inferior weapon compared to the bow. The average Mamluk archer for example was capable of hitting targets only 68 meters far away but could keep up a pace of six to eight shots per minute. In comparison, sixteenth-century matchlocks fired off one shot every several minutes, and much less when taking into consideration misfires and malfunctions which occurred up to half the time. This is not to say that firearms of the 16th century were inferior  to the bow and arrow, for it could better penetrate armor and required less training, but the disadvantages of the musket were very real, and it would not be until the 1590s that archers were for the most part phased out of "European" warfare. This was possibly a consequence of the increased effectiveness of musket warfare due to the rise of volley fire in Europe as first applied by the Dutch. At this time gunners in European armies reached as high as 40 percent of infantry forces. As the virtues of the musket became apparent it was quickly adopted throughout  Eurasia so that by 1560 even in China generals were giving praise to the new weapon. Qi Jiguang, a noted partisan of the musket, gave a eulogy on the effectiveness of the gun in 1560: Other East Asian powers such as Đại Việt also adopted the matchlock musket in quick order. Đại Việt in particular was considered by the Ming to have produced the most advanced matchlocks in the world during the 17th century, surpassing even Ottoman, Japanese, and European firearms. European observers of the Trịnh–Nguyễn War also corroborated with the Ming in the proficiency of matchlock making by  the Vietnamese. The Vietnamese matchlock was said to have been able to pierce several layers of iron armour, kill two to five men in one shot, yet also fire quietly for a weapon of its caliber. Gunpowder Empires. The Gunpowder Empires generally refer to the Islamic Ottoman, Safavid and Mughal empires. The phrase was first coined by Marshall Hodgson in the title of Book 5 ("The Second Flowering: The Empires of Gunpowder Times") of his highly influential three-volume work, "The Venture of Islam" (1974). Hogdson applied the term "gunpowder empire" to three Islamic political entities he identified as separate  from the unstable, geographically limited confederations of Turkic clans that prevailed in post-Mongol times. He called them "military patronage states of the Later Middle Period," which possessed three defining characteristics: first, a legitimization of independent dynastic law; second, the conception of the whole state as a single military force; third, the attempt to explain all economic and high cultural resources as appanages of the chief military families. Connecting these empires were their traditions which grew "out of Mongol notions of greatness," but "[s]uch notions could fully mature and create stable bureaucratic empires only after gunpowder weapons and their specialized  technology attained a primary place in military life." William H. McNeill further expanded on the concept of gunpowder empires by arguing that such states "were able to monopolize the new artillery, central authorities were able to unite larger territories into new, or newly consolidated, empires." In 2011 Douglas E. Streusand criticized the Hodgson-McNeill Gunpowder-Empire hypothesis, calling it into disfavor as a neither "adequate [n]or accurate" explanation, although the term remains in use. The main problem he saw with the Hodgson-McNeill theory is that the acquisition of firearms does not seem to have preceded the initial acquisition of  territory constituting the imperial critical mass of any of the three early modern Islamic empires, except in the case of the Mughals. Moreover, it seems that the commitment to military autocratic rule pre-dated the acquisition of gunpowder weapons in all three cases. Whether or not gunpowder was inherently linked to the existence of any of these three empires, it cannot be questioned that each of the three acquired artillery and firearms early in their history and made such weapons an integral part of their military tactics. Ottoman Empire. It's not certain when the Ottomans started using firearms , however it's argued that they had been using cannons since the Battles of Kosovo (1389) and Nukap (1396) and most certainly by the 1420s. Some argue that field guns only entered service shortly after the Battle of Varna (1444) and more certainly used in the Second Battle of Kosovo (1448). Firearms, (especially grenades) were used in the 1683 siege of Vienna The arquebus reached them around 1425. India and the Mughal Empire. In India, guns made of bronze were recovered from Calicut (1504) and Diu (1533). By the 17th century, Indians were manufacturing a diverse variety of firearms; large  guns in particular, became visible in Tanjore, Dacca, Bijapur and Murshidabad. Gujarāt supplied Europe saltpeter for use in gunpowder warfare during the 17th century. Bengal and Mālwa participated in saltpeter production. The Dutch, French, Portuguese, and English used Chāpra as a center of saltpeter refining. Fathullah Shirazi (c. 1582), who worked for Akbar the Great as a mechanical engineer, developed an early multi gun shot. Shirazi's rapid-firing gun had multiple gun barrels that fired hand cannons loaded with gunpowder. Mysorean rockets were an Indian military weapon, the first iron-cased rockets successfully deployed for military use. The Mysorean  army, under Hyder Ali and his son Tipu Sultan, used the rockets effectively against the British East India Company during the 1780s and 1790s. The Indian war rockets were formidable weapons before such rockets were used in Europe. They had bam-boo rods, a rocket-body lashed to the rod, and iron points. They were directed at the target and fired by lighting the fuse, but the trajectory was rather erratic. The use of mines and counter-mines with explosive charges of gunpowder is mentioned for the times of Akbar and Jahāngir. Civil engineering. Canals. Gunpowder was used for hydraulic  engineering in China by 1541. Gunpowder blasting followed by dredging of the detritus was a technique which Chen Mu employed to improve the Grand Canal at the waterway where it crossed the Yellow River. In Europe, gunpowder was utilized in the construction of the Canal du Midi in Southern France. It was completed in 1681 and linked the Mediterranean sea with the Atlantic with 240 km of canal and 100 locks. Another noteworthy consumer of black powder was the Erie canal in New York, which was 585 km long and took eight years to complete, starting in 1817. Mining. Before  gunpowder was applied to civil engineering, there were two ways to break up large rocks, by hard labor or by heating with large fires followed by rapid quenching. The earliest record for the use of gunpowder in mines comes from Hungary in 1627. It was introduced to Britain in 1638 by German miners, after which records are numerous. Until the invention of the safety fuse by William Bickford in 1831, the practice was extremely dangerous. Another reason for danger were the dense fumes given off and the risk of igniting flammable gas when used in coal mines. Tunnel construction. Gunpowder  was also extensively used in railway construction. At first railways followed the contours of the land, or crossed low ground by means of bridges and viaducts, but later railways made extensive use of cuttings and tunnels. One 2400-ft stretch of the 5.4 mi Box Tunnel on the Great Western Railway line between London and Bristol consumed a ton of gunpowder per week for over two years. The 12.9 km long Mont Cenis Tunnel was completed in 13 years starting in 1857 but, even with black powder, progress was only 25 cm a day until the invention of pneumatic drills  sped up the work. United States. Revolutionary War. During the American Revolutionary War, a number of caves were mined for saltpeter to make gunpowder when supplies from Europe were embargoed. Abigail Adams reputedly also made gunpowder at her family farm in Massachusetts. The New York Committee of Safety produced some essays on making gunpowder that were printed in 1776. Civil War. During the American Civil War, British India was the main source for saltpeter for the manufacture of gunpowder for the Union armies. This supply was threatened by the British government during the Trent Affair, when Union naval forces stopped  a British ship, the RMS Trent, and removed two Confederate diplomats. The British government responded in part by halting all exports of saltpeter to the United States, threatening their gunpowder manufacturing resources. Shortly thereafter, the situation was resolved and the Confederate diplomats were released. The Union Navy blockaded the southern Confederate States, which reduced the amount of gunpowder that could be imported from overseas. The Confederate Nitre and Mining Bureau was formed to produce gunpowder for the army and the navy from domestic resources. Nitre is the English spelling of "Niter". While carbon and sulfur were readily available throughout the  south, potassium nitrate was often produced from the Calcium nitrate found in cave dirt, tobacco barn floors and barn stalls other places. A number of caves were mined, and the men and boys who worked in the caves were called "peter monkey", somewhat in imitation of the naval term "powder monkey" that was used for the boys who brought up charges of gunpowder on gunboats. On 13 November 1862, the Confederate government advertised in the Charleston Daily Courier for 20 or 30 "able bodied Negro men" to work in the new nitre beds at Ashley Ferry, S.C. The nitre beds  were large rectangles of rotted manure and straw, moistened weekly with urine, "dung water", and liquid from privies, cesspools and drains, and turned over regularly. The process was designed to yield saltpeter, an ingredient of gunpowder, which the Confederate army needed during the Civil War. The South was so desperate for saltpeter for gunpowder that one Alabama official reportedly placed a newspaper ad asking that the contents of chamber pots be saved for collection. In the winter of 1863, scores of enslaved people were set to work extracting it from a huge cave in Barstow County, Ga., where they labored  by torchlight in grim conditions, hauling out and processing the so-called "peter dirt". In South Carolina, in April 1864, the Confederate government hired 31 enslaved people to work at the Ashley Ferry Nitre Works. Decline. The latter half of the 19th century saw the invention of nitroglycerin, nitrocellulose and smokeless powders which soon replaced traditional gunpowder in most civil and military applications.