Chinese siege weapons

This is an overview of Chinese siege weapons.

Siege ladders

Siege ladders were used starting from the Warring States period. A hinged folding ladder known as the "cloud ladder" was quite prominent. Originally it used a counterweight to unfold once within reach of the enemy walls, but the contraption proved to be too vulnerable, and switched to a simple pulling mechanism during the Song dynasty. The newer version had men pull on ropes from behind with the aid of a long pole to move the top ladder into position. Some ladders had a compartment built below it to house soldiers who provided covering fire with crossbows.[1]

Hook carts

Hook carts such as the fork and falcon carts were used to pull down parapets and the top part of walls to make it easier for ladders to access. Once attached, 50 to 100 men took hold of a rope and pulled until the wall came down. They were used as early as the Three Kingdoms period, as mentioned by Chen Lin:

The hook carts join the fray and the nine oxen turn and heave, bellowing like thunder, and furiously smash the towers and overturn the parapets... Then the flying ladders, movable overlooks, cloud pavilions and the buildings in the void are rolled forward into the breaches so that the attackers can swarm into the city.[2]

Chen Lin

Assault cover

Various protective covers were used during a siege. The most typical were mobile screens and assault wagons. More complex contraptions such as plaited galleries were used for mining and filling in moats.[3]

Observation tower

Static observation towers such as the nest and watchtower carts were used to see into the city.[4] Static towers were also be used in close proximity to enemy walls to rain down projectiles on the defenders.[5]

Mobile siege tower

Mobile siege towers have been used in China since the 6th century BC. They were often called overlook carts, assault carts, or some combination of the two.[2] A typical mobile siege tower was five stories tall mounted on axles with two wheels on each side. The tower was pushed forward by men on the lowest storey or pulled by horses and oxen.[6]

The king of Wu mentioned it in a passage comparing land armies to the navy.

These days in training we use the (same) tactics of land armies for the best effect. Thus big wing ships correspond to the army's heavy chariots, small wing ships to their light chariots, stomach strikers to battering rams, castled ships to mobile assault towers and bridge ships to the light cavalry.[2]

King of Wu (514 – 496 BC)

During the Tang dynasty, in the 783 siege of Fengtian, an assault cart protected by layers of cowhide and equipped with leather bags of water to douse fires was used in an attempt to breach the city. The defenders managed to dig a trench in front of the siege engine, which tipped it over, and they burnt it and had it destroyed.[2]

In 1132 the Jurchen Jin dynasty constructed assault carts called "sky bridges" during the Siege of De'an, but failed to reach the enemy walls due to the use of long beams to push them away.[7]

The last recorded use of assault carts was in 1851 by the Taiping rebels to besiege Guilin after their first attempt with ladders failed. They mounted cannons on it to bombard the Qing soldiers manning the walls, but the tower was destroyed by a combination of burning oil and long poles wrapped in incendiary material at the ends.[2]

Ram

The Chinese ram used an iron-plated head. After the introduction of gunpowder it added a cannon as well.[3]

Traction trebuchet

The traction trebuchet, also referred to as a mangonel in some sources, is an artillery weapon which derives from manpower its motive force, and was probably used by the Mohists starting from the 4th century BC. Descriptions of it can be found in the Mojing (compiled in the 4th century BC). It consisted of an arm and sling mounted on a wooden frame, sometimes with wheels. Attached to one end of the arm were pulling ropes for men to power the weapon.[8] In Chapter 14 of the Mojing, the traction trebuchet is described hurling hollowed out logs filled with burning charcoal at enemy troops.[2] Trebuchets mounted on wheels were said to have needed 200 men to pull each of them.[9]

By the Qin and Han dynasties, traction trebuchets were a common weapon used in both attack and defense. Later on in 617 Li Mi (Sui dynasty) constructed 300 trebuchets for his assault on Luoyang, in 621 Li Shimin did the same at Luoyang, and onward into the Song dynasty when in 1161, trebuchets operated by Song dynasty soldiers fired bombs of lime and sulphur against the ships of the Jin dynasty navy during the Battle of Caishi.[10]

"Whirlwind" and "four footed" trebuchets appeared during the Tang dynasty. The whirlwind trebuchet used a single vertical pole which could be rotated 360 degrees for increased versatility at the cost of projectile strength. The four footed trebuchets were essentially the same as the previous Warring States weapons, differentiated from the whirlwinds by specifying its stability and larger size.[11]

As defensive weapons, traction trebuchets were positioned behind city walls and guided by an "artillery observer" on the walls. Range was determined by the strength and number of men pulling. Increasing and decreasing range meant adding and removing men from the pulling ropes.[11]

The traction trebuchet continued to be used until the counterweight trebuchet was introduced in 1272 during the Mongol conquest of the Song dynasty.[11]

Wheel catapult

A military engineer of the Three Kingdoms period, Ma Jun, devised a device which threw large stones using a wheel. This device consisted of a drum wheel attached with a curved knife. When rotated, the stones which hung on the wheel would be cut loose by the knife and launched. It is not clear how well this device worked in practice. Successful tests with roof tiles instead of stones are mentioned, but according to Liang Jieming, this contraption never made it past the testing phase and could not have been possible with the available technology at the time.[2]

Counterweight trebuchet

The introduction of the counterweight trebuchet in China is usually attributed to Muslim engineers during the Battle of Xiangyang in 1273, but it is possible that it was independently invented earlier in 1232 by the Jurchen Jin commander Qiang Shen. Qiang Shen invented a device called the "Arresting Trebuchet" which only needed a few men to work it, and could hurl great stones more than a hundred paces, further than even the strongest traction trebuchet. However no details on the construction of the machine are given. Qiang died the following year and no further references to the Arresting Trebuchet appear.[2]

The counterweight trebuchet, known as the Muslim trebuchet in China, replaced the traction version after its introduction in the late 13th century. Its greater range was however, somewhat countered by the fact that it had to be constructed at the site of the siege unlike traction trebuchets, which were easier to take apart and put back together again where necessary.[12]

The counterweight trebuchet remained in use in China for roughly two centuries, at which point it was well on its way to obsolescence.[13]

WeaponCrewProjectile weight (kg)Range (m)
Whirlwind trebuchet501.878
Crouching tiger trebuchet707.2578
Four footed (one arm) trebuchet401.178
Four footed (two arm) trebuchet10011.3120
Four footed (five arm) trebuchet15744.578
Four footed (seven arm) trebuchet25056.778
Counterweight trebuchet?~86200–275

Mounted crossbow

Large crossbows called "bed crossbows" were mounted on rectangular frameworks, often wheeled. Bowstaves were also sometimes combined together to increase tension and initial velocity of the bolt.[14]

Bed crossbow

Large mounted crossbows known as "bed crossbows" were used as early as the Warring States period. Mozi described them as defensive weapons placed on top the battlements. The Mohist siege crossbow was described as humongous device with frameworks taller than a man and shooting arrows with cords attached so that they could be pulled back. By the Han dynasty, crossbows were used as mobile field artillery and known as "Military Strong Carts".[2] Around the 5th century AD, multiple bows were combined together to increase draw weight and length, thus creating the double and triple bow crossbows. Tang versions of this weapon are stated to have obtained a range of 1,160 yards, which is supported by Ata-Malik Juvayni on the use of similar weapons by the Mongols in 1256.[15] According Juvayni, Hulagu Khan brought with him 3,000 giant crossbows from China, for the siege of Nishapur, and a team of Chinese technicians to work a great 'ox bow' shooting large bolts a distance of 2,500 paces, which was used at the siege of Maymun Diz.[16] Constructing these weapons, especially the casting of the large triggers, and their operation required the highest order of technical expertise available at the time. They were primarily used from the 8th to 11th centuries.[17]

Joseph Needham on the range of the triple-bow crossbow:

This range seems credible only with difficulty, yet strangely enough there is a confirmation of it from a Persian source, namely the historian 'Alā'al-Dīn al-Juwainī, who wrote of what happened when one of the almost impregnable castles of the Assassins was taken by Hulagu Khan. Here, in +1256, the Chinese arcuballistae shot their projectiles 2500 (Arab) paces (1,100 yards) from a position on the top of some mountain... His actual words are: "and a kamān-i-gāu which had been constructed by Cathayan craftsmen, and which had a range of 2500 paces, was brought to bear on those fools, when no other remedy remained, and of the devil-like Heretics many soldiers were burnt by those meteoric shots". The castle in question was not Alamūt itself, but Maimūn-Diz, also in the Elburz range, and it was the strongest military base of the Assassins.[18]

Joseph Needham

Multiple bolt crossbow

The multiple bolt crossbow appeared around the late 4th century BC. A passage dated to 320 BC states that it was mounted on a three-wheeled carriage and stationed on the ramparts. The crossbow was drawn using a treadle and shot 10 foot long arrows. Other drawing mechanisms such as winches and oxen were also used.[19] Later on pedal release triggers were also used.[20] Although this weapon was able to discharge multiple bolts, it was at the cost of reduced accuracy.[2] It had a maximum range of 500 yards.[21]

When Qin Shi Huang's magicians failed to get in touch with "spirits and immortals of the marvellous islands of the Eastern Sea", they excused themselves by saying large monsters blocked their way. Qin Shi Huang personally went out with a multiple bolt crossbow to see these monsters for himself. He found no monsters but killed a big fish.[22]

In 99 BC, they were used as field artillery against attacking nomadic cavalry.[2]

In 759 AD, Li Quan described a type of multiple bolt crossbow capable of destroying ramparts and city towers:

The arcuballista is a crossbow of a strength of 12 dan, mounted on a wheeled frame. A winch cable pulls on an iron hook; when the winch is turned round until the string catches on the trigger the crossbow is drawn. On the upper surface of the stock there are seven grooves, the centre carrying the largest arrow. This has a point 275 centimetres (108 in) long and 125 centimetres (49 in) round, with iron tail fins 125 cm round, and a total length of 91.5 cm. To left and right there are three arrows each steadily decreasing in size, all shot forth when the trigger is pulled. Within 700 paces (525 m) whatever is hit will collapse, even solid things like ramparts and city towers."[2]

Li Quan

In 950 AD, Tao Gu described multiple crossbows connected by a single trigger:

The soldiers at the headquarters of the Xuan Wu army were exceedingly brave. They had crossbow catapults such that when one trigger was released, as many as 12 connected triggers would all go off simultaneously. They used large bolts like strings of pearls, and the range was very great. The Jin people were thoroughly frightened by these machines. Literary writers called them Ji Long Che (Rapid Dragon Carts).[2]

Tao Gu

The weapon was considered obsolete by 1530.[20]

Handheld bows
WeaponShots per minuteRange (m)
Chinese composite bow150
Manchu bow180–230
Chinese crossbow170–450
Cavalry crossbow150–300
Repeating crossbow28–4873–180
Double shot repeating crossbow56–9673–180
Siege crossbows
WeaponCrewShots per minuteRange (m)
Mounted multi-bolt6–12365–460
Mounted single-bow250–500
Mounted double-bow4–7350–520
Mounted triple-bow20–301,060

Incendiaries

Prior to the introduction of gunpowder, fire arrows used mineral oil and sulphur as incendiaries. They were most commonly used by defenders to burn enemy siege engines such as ladders and rams. They were also used create fires in defending cities.[23]

Gunpowder

When gunpowder arrived in the 10th century, fire arrows switched to gunpowder incendiaries. 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.[24] When the Jin captured Kaifeng in 1126 they captured 20,000 fire arrows for their arsenal.[25]

Gunpowder was also used in fire balls launched by trebuchets. "Barbed fire balls" used a series of hooks to latch onto its target. A "molten metal bomb" also saw use during the Jin siege of Kaifeng in 1126. These were ceramic containers filled with molten metal kept in a mobile furnace.[26]

Fire birds were a form of live delivery system for incendiaries. A walnut sized piece of burning tinder was tied to the birds' neck or leg. The idea was that once released, they would settle on the roofs of the enemy city, setting fire to the thatch.[27]

The fire ox was another live delivery system. The ox was let loose with two spears attached to its sides and an incendiary tied to its behind. Later on a delayed-action bomb was also added.[28]

Greek fire entered the Chinese arsenal around the year 900. The flamethrower consisted of a brass container and a horizontal pump connected to the gunpowder ignition chamber. When pushed, the pump caused burning petrol to squirt out. It was recommended that these devices be placed on the walls so that when rolls of straw were thrown at siege engines, they would be ignited by the petrol fire. Flamethrowers were also used at sea, sometimes disastrously. In 975 the commander of Southern Tang's navy panicked when enemy ships assaulted them with a barrage of arrows. In desperation, he projected petrol from flamethrowers at the enemy, but a sudden northern wind blew the flames in the opposite direction, setting his entire fleet ablaze. The commander jumped into the fire and died.[29]

Chemical warfare

Gas bombs consisting of gunpowder mixed with various poisons wrapped in hemp and moxa were used as defensive weapons. These were said to cause great discomfort in the enemy, having effects such as bleeding from the mouth and nose. Other than poison, lime and excrement were also used for their noxious and blinding properties.[30]

Various defensive measures

References

  1. Turnbull 2002, p. 40.
  2. Liang 2006.
  3. Turnbull 2002, p. 43.
  4. Turnbull 2008, p. 38-39.
  5. Needham 1994, p. 435.
  6. Needham 1994, p. 439.
  7. Andrade 2016, p. 36.
  8. Turnbull 2001, p. 18.
  9. Turnbull 2001, p. 18-19.
  10. Needham 1986, p. 166.
  11. Turnbull 2001, p. 19.
  12. Turnbull 2001, p. 33.
  13. Turnbull 2001, p. 36.
  14. Needham 1994, p. 185.
  15. Turnbull 2002, p. 14.
  16. Nicolle 2003, p. 23.
  17. Needham 1994, p. 198.
  18. Needham 1994, p. 177.
  19. Needham 1994, p. 189-190.
  20. Needham 1994, p. 192.
  21. Needham 1994, p. 176.
  22. Needham 1994, p. 188.
  23. Turnbull 2001, p. 37.
  24. Andrade 2016, p. 32.
  25. Andrade 2016, p. 35.
  26. Turnbull 2001, p. 38.
  27. Turnbull 2001, p. 39.
  28. Turnbull 2001, p. 40.
  29. Turnbull 2001, p. 41.
  30. Turnbull 2001, p. 43.

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