Technology & Medicine › Medieval › Gunpowder
Gunpowder weapons and cannon
c. 1280s (China); Europe by 1326· Invention or discovery· Tools, energy & materials
Mostly agreedGood evidence; some details, dates or numbers uncertain.
Tubes of bronze or iron that use exploding gunpowder to fire projectiles, from Chinese hand cannons to siege guns that broke city walls.
See it on the Technology & Medicine map →How it works
Chinese soldiers first packed gunpowder into bamboo fire lances, then metal barrels; a bronze hand cannon found in Heilongjiang dates to about 1288. Guns reached Europe by 1326, when a Florence decree and an English manuscript record them. In Korea, Choe Mu-seon's cannon helped destroy a large Japanese pirate fleet at Jinpo in 1380. In 1453 huge Ottoman bombards breached the walls of Constantinople. Handheld guns gradually replaced the bow, and tall castles gave way to low, thick star-shaped forts.
Why it mattered
Guns shifted war toward whoever could pay for metal, powder and drilled infantry, helping build centralized states and making the medieval castle obsolete.
Think of it like
Like a new building code that makes a whole property type obsolete: tall stone walls lost their value once cannon could knock them down.
How we know
Surviving guns such as the Heilongjiang hand cannon and the Xanadu gun dated 1298; the 1326 Florence decree and Walter de Milemete's illustrated manuscript; chronicles of sieges such as Constantinople.
Still unknown or debated
Whether guns arose once in China and spread west, or Europe partly reinvented them, is debated, as is how much guns drove a 'military revolution' in state-building.
Connections (6)
▸Bow and arrow was eventually replaced in war by Gunpowder weapons and cannonWell documented
The connection
The bow was the main long-range weapon for tens of thousands of years. Gunpowder weapons slowly replaced it: early guns were slow and inaccurate, but a musketeer could be trained in weeks, while a skilled archer took years. By about 1600 most European armies had dropped bows; in East Asia, archery lasted longer.
When and how
Across Eurasia from the 1300s to the 1600s; English longbowmen at Crécy in 1346 probably fought alongside a few early cannon, and England largely gave up the longbow in the 1590s.
How we know
Military records, arsenal inventories and treatises document the switch, such as England's 1595 order replacing bows with firearms in its militia.
Debates and open questions
Historians debate why guns won so early, since good archers outshot early muskets; cheaper training, armor penetration and state finances are leading explanations.
▸Iron smelting (the Iron Age) supplied cheaper metal for Gunpowder weapons and cannonMostly agreed
The connection
Early cannon were cast in bronze, strong but expensive, or built from wrought-iron bars bound with hoops, like a barrel. Chinese foundries cast iron guns by the late 1300s, and England learned to cast reliable iron cannon in 1543. Cheap iron let states arm ships and forts with many more guns.
When and how
Bronze and wrought-iron guns in Europe from the 1320s; cast-iron cannon in Ming China by the late 1300s and in Sussex, England, from 1543 under Ralph Hogge.
How sure are we?
Surviving guns, foundry records and naval inventories show the shift; England's cheap iron guns armed its navy and became a major export.
Debates and open questions
Iron guns were cheaper but heavier and more likely to burst, so bronze stayed preferred for some uses into the 1700s; how fast the switch happened varied by country.
▸Gunpowder led to Gunpowder weapons and cannonWell documented
The connection
Chinese alchemists found gunpowder by about 850, and it was first used in fire arrows and bombs. Soldiers then packed it into bamboo tubes as fire lances, and finally into metal barrels strong enough to hurl projectiles. The cannon was the step where gunpowder became a propellant rather than just a fire weapon.
When and how
China, from fire lances in the 1100s to metal guns by about 1288, then across Eurasia through Mongol-era contacts; Europe had guns by 1326.
How we know
Chinese military manuals such as the 1044 Wujing Zongyao, surviving Yuan-dynasty guns, and the 1326 European records trace the steps.
Debates and open questions
Whether Europeans learned of guns from Mongols or Arab traders, or reinvented them after learning of gunpowder, is unresolved.
▸Gunpowder weapons and cannon drove the search that produced the Bessemer steel processWell documented
The connection
During the Crimean War, Bessemer designed a spinning artillery shell. Military men told him existing cast-iron cannon could not safely fire it. Seeking a stronger metal for guns, he experimented with blowing air through molten iron and found that it purified the metal into steel.
When and how
London and France, 1854–56; Bessemer tested his shell at Vincennes with encouragement from Napoleon III.
How we know
Bessemer's patents and his autobiography (1905) describe the chain from shell to gun metal to converter; the account is his own, written decades later.
Debates and open questions
How much of the story is Bessemer's later polishing, and whether his other ironmaking work would have reached the process anyway, is uncertain.
▸Gunpowder weapons and cannon posed the ballistics problems studied by Galileo GalileiMostly agreed
The connection
Gunners wanted to know how far a cannonball would fly at a given angle. Niccolò Tartaglia tackled the question in 1537, and Galileo, who taught fortification and sold a calculating instrument for gunners, answered it: ignoring air resistance, a projectile follows a parabola. He published the proof in Two New Sciences in 1638.
When and how
Padua, where Galileo taught military engineering in the 1590s–1600s, and Arcetri near Florence, where he finished Two New Sciences under house arrest; published in Leiden in 1638.
How sure are we?
Two New Sciences discusses projectiles and range tables for gunners, and Galileo's printed manual for his military compass survives.
Debates and open questions
How much gunnery drove Galileo's physics, versus pure curiosity about motion, is debated; his parabola ignored air resistance, so it rarely matched real cannon fire.
▸Gunpowder weapons and cannon caused the gunshot wounds treated by Ambroise ParéWell documented
The connection
Firearms created a new kind of wound: deep, dirty and torn. Surgeons believed gunpowder poisoned wounds and treated them with boiling oil. Serving with French armies, Paré treated many such wounds, and his milder dressings and tied-off arteries came directly from that battlefield work.
When and how
French campaigns in Italy and France from 1537, starting at the siege of Turin; his treatise on gunshot wounds appeared in Paris in 1545.
How we know
The 1545 book's title names wounds from arquebuses and other firearms, and his case notes describe battlefield treatment.
Debates and open questions
How quickly other surgeons abandoned boiling oil after Paré is unclear; the practice lingered in places for decades.