Battles & Wars › Greece, Rome & Han › Warring States and the Qin unification of China
Crossbow
China by c. 500 BC; common in Europe from c. 1000· Invention or discovery· Weapons, armor & warships
Mostly agreedGood evidence; some details, dates or numbers uncertain.
A bow mounted on a stock with a mechanical trigger, which lets a soldier aim and shoot powerful bolts with little training.
See it on the Battles & Wars map →What happened
A crossbow holds the drawn string on a catch, so a soldier can cock it with arms, legs or a winch, then aim and shoot by pulling a trigger. Chinese states used it by about 500 BC, with precise bronze trigger mechanisms made in large numbers. Greeks and Romans had related machines. In medieval Europe, powerful crossbows wound by crank could pierce mail armor. They were slow to reload: about two shots a minute against a longbowman's six to ten.
Why it matters
It let barely trained commoners kill armored nobles, which alarmed elites: the Church's Second Lateran Council of 1139 banned crossbows and bows against Christians, with little effect.
How we know
Bronze trigger mechanisms from Warring States and Qin tombs, including the Terracotta Army; Chinese military texts; medieval crossbows in museums; and church and chronicle records.
Still debated
Where the crossbow was first invented, in China or among peoples to its south, is debated, and so is how Europe acquired it.
Connections (4)
▸Crossbow armed the mass armies of the Warring States and the Qin unification of ChinaMostly agreed
The connection
Warring States armies grew to hundreds of thousands of conscripts. Crossbows suited them: farmers could be trained quickly, and standardized bronze triggers were made in state workshops. The Qin army that unified China in 221 BC included large crossbow units, as the Terracotta Army shows.
When and how
China, 475–221 BC. At Maling in 342 BC, the Qi strategist Sun Bin is said to have ambushed the Wei army with massed crossbows.
How sure are we?
Thousands of bronze trigger mechanisms with interchangeable parts from tombs and the Terracotta Army, and accounts in Sima Qian's 'Records of the Grand Historian'.
Debates and open questions
How large crossbow units were in battle, and how decisive they were against chariots and cavalry, are debated.
▸Crossbow lost to the English longbow at the Battle of CrécyWell documented
The connection
At Crécy, Genoese mercenary crossbowmen led the French attack against English longbowmen on higher ground. The longbows shot several times faster, and the Genoese reportedly lacked their large shields, left with the baggage. They fell back and were ridden down by impatient French knights.
When and how
Crécy, northern France, August 26, 1346: Edward III of England against Philip VI of France.
How we know
Chroniclers including Jean Froissart and Giovanni Villani describe the Genoese crossbowmen's failure.
Debates and open questions
Claims that rain soaked their bowstrings are debated, as are numbers: perhaps 2,000–6,000 Genoese. How big the longbow's real edge was is also argued.
▸Crossbow could pierce the armor of Stirrup and heavy cavalry (knights)Mostly agreed
The connection
From about 1000, European crossbows could punch through mail armor at close range, letting a commoner kill a knight who had trained from boyhood. Knights responded over time with plate armor, and lords hired crossbow mercenaries. In 1139 the Church tried to ban them in wars between Christians.
When and how
Western Europe and the crusader states, 11th–14th centuries. Richard I of England, who used crossbowmen heavily, died of a crossbow wound in 1199.
How sure are we?
Chronicles, the Second Lateran Council's canon, surviving crossbows and armor, and modern tests of bolts against mail.
Debates and open questions
How much crossbows, rather than longbows or later pikes and guns, drove the shift to plate armor is debated.
▸Qin state arms workshops (the Terracotta Army's bronzes) mass-produced standardized triggers for the CrossbowMostly agreed
The connection
The crossbow's bronze trigger was a precise mechanism of several cast parts. Qin workshops made them to such consistent sizes that parts may have been interchangeable. Crossbows were a main Qin weapon: many Terracotta Army archers carried them, and standard parts would have made field repair easier.
When and how
Qin workshops, 3rd century BC; triggers found with the Terracotta Army near Xi'an, from about 210 BC.
How sure are we?
Archaeologists' measurements of excavated triggers show closely matched dimensions; the crossbows' wooden parts survive only as traces.
Debates and open questions
How interchangeable the parts truly were is debated: they matched closely but probably still needed fitting by hand.