Siege of De'an

Part of the Jin–Song Wars

Date	1132
Location	De'an (modern Anlu in eastern Hubei), China
Result	Song victory

Belligerents

Jurchen Jin

Southern Song

Commanders and leaders

Li Heng

Chen Gui

Strength

10,000

The Siege of De'an (德安之戰) was fought as part of the Jin-Song Wars of China in 1132, during the Jin invasion of Hubei and Shaanxi. The battle between the Jurchen Jin besiegers and the Song Chinese defenders is important in global history as the first recorded instance of the fire lance, an early ancestor of firearms, being used in battle.

Jin forces led by Li Heng (李橫) encircled the city of De'an (德安; modern Anlu in eastern Hubei) with a force of 10,000, established around 70 stockades, and set up watch towers to observe enemy movements within the city and relay their positions by fire at night and bright flags by day. Carpenters, smiths, and leatherworkers from nearby areas were forced to construct mobile assault towers called "sky bridges" that could be wheeled to the walls for soldiers to make a frontal assault on the ramparts. In response, the prefect of De'an, Chen Gui (陳規) ordered the garrisons to construct defensive structures atop the walls to hide their movements and protect against enemy arrows and trebuchet projectiles. These were constantly damaged by enemy fire, but were repaired in kind. After defensive structures had been completed, trebuchets were deployed to return fire against Jin siege weapons, damaging them to great effect. The protracted siege forced Jin troops to scour the countryside for food while De'an's moat prevented a direct attack on the city itself. Eventually Jin resorted to using children, women, and the elderly to gather material, including their own bodies, to fill the moat, but this was ultimately unsuccessful as Chen retaliated by firing gunpowder arrows into the moat, burning the wood and straw filling. Jin forces tried again, this time with mud and brick caked filling, and once they deemed the moat sufficiently filled, started their assault. Sky bridges rolled up to the walls under cover of archers and trebuchet fire, but Chen's defenders used long beams to keep them from getting any closer than ten feet from the walls.

While soldiers were stuck on their assault platforms, De'an defenders unleashed the fire lances: "Using fire-bomb medicine (火砲藥), long bamboo lances were made ready. More than twenty of them, as well as good numbers of striking spears and hook-blade staves (鉤鐮), all of which would be deployed, with two people holding one together, and which were made in such a way that when the sky bridges approached the wall, [the defenders could] emerge from above and below their defense structures and deploy them." Fire lancers used their weapons to attack the sky bridge porters: "As the sky bridges became stuck fast, more than ten feet from the walls and unable to get any closer, [the defenders] were ready. From below and above the defensive structures they emerged and attacked with fire lances, striking lances, and hooked sickles, each in turn. The people [i.e., the porters] at the base of the sky bridges were repulsed. Pulling their bamboo ropes, they [the porters] ended up drawing the sky bridge back in an anxious and urgent rush, going about fifty paces before stopping."

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