The Fire Lance: The First Gunpowder Weapon

The Chinese flamethrower, known as the "fierce-fire oil cabinet" (猛火油柜), was an early weapon that sprayed burning petroleum at enemy ships and siege works. Developed in the Tang and Song dynasties from naturally occurring "fire oil" (猛火油, petroleum seepages), it paired a reservoir, a pump, and a nozzle to project flame—making China a pioneer of liquid-fire warfare centuries before similar devices appeared in the Mediterranean. It belongs to the same gunpowder revolution that produced the fire lance and rocket.

Sources of "Fire Oil"

The fuel was petroleum, which Chinese sources call "fire oil" because it burned fiercely and could not be doused with water. It was collected from natural seeps, notably in the Yan'an region of northern Shaanxi and from wells in Sichuan, and valued precisely because it floated and kept burning on water.

Its resistance to water made it ideal against wooden ships, the dominant naval technology of the age. The challenge was not finding the oil but delivering it reliably onto an enemy.

The Fierce-Fire Oil Cabinet

The Wujing Zongyao (《武经总要》, "Collection of the Most Important Military Techniques," 1044) describes the meng huo you gui: a brass or iron tank of oil fitted with a piston pump and a coiled hose ending in a nozzle. A soldier worked the pump while another lit the jet, producing a jet of flame.

The cabinet was usually mounted on a frame for use on city walls or decks. In its double-chambered form, a pair of tanks gave a steadier, longer stream, a sophisticated piece of military engineering.

Role in Naval and Siege Warfare

Flamethrowers were deployed against enemy fleets, setting hulls and rigging alight, and against siege towers and ramps during defence of walled cities. Because the burning oil spread on water, it was especially feared in river and coastal battles.

Song commanders used fire oil alongside gunpowder weapons, and specialised units trained to operate the cabinets. The weapon's psychological effect—walls of flame—was as valuable as its physical damage.

The Fire Lance Connection

The flamethrower's era also saw the fire lance (火枪), a spear with a tube of gunpowder that ejected flame and sparks. Both represent the same impulse to project fire at close range, and their technologies cross-fertilised as gunpowder matured.

Early fire lances used a bamboo tube filled with a low-nitrate mixture that flared rather than exploded; over time this evolved toward true firearms, with the flamethrower remaining the liquid-fuel cousin of the gunpowder line.

Recorded in the Military Encyclopaedias

The Wujing Zongyao, compiled for the Song court, is our richest source, with illustrations and instructions for the oil cabinet and many other devices. Such state-sponsored manuals show that flame weapons were part of a systematic, documented military science.

Later Ming books continued to describe fire oil and its uses, confirming a long continuity of interest in liquid-fire arms in China.

Decline and Historical Significance

As gunpowder weapons grew more powerful and reliable, the petroleum flamethrower became less central, though it never entirely disappeared from Chinese arsenals. Its importance lies in priority: China fielded a pumped, nozzle-projected flamethrower long before analogous Greek-fire devices were documented elsewhere.

The fierce-fire oil cabinet stands as a reminder that the history of chemical and liquid-fire warfare is as much Chinese as it is Mediterranean.

Operating the Oil Cabinet

Using the device took a two-person crew: one worked the piston pump while another lit and aimed the jet, and both had to time their actions so the oil ignited only at the nozzle. Manuals stressed training and warned that a poor light could let the flame flare backward toward the operators.

Safety notes in the military texts show that the weapon was treated as a serious, hazardous system, not a novelty. Crews drilled with water and cold oil before facing real fire, reflecting a disciplined approach to a dangerous arm.

Comparison with Greek Fire

The Chinese oil cabinet is often compared with Byzantine Greek fire, yet the two arose independently and the Chinese pumped, nozzle-projected flamethrower is documented earlier in that form. Both used burning petroleum or naphtha, but the Chinese record gives clear mechanical detail from the eleventh century.

Rather than one flowing into the other, the parallel shows that several civilisations, facing wooden ships and walled cities, arrived independently at the idea of projecting liquid fire as a weapon.

Sourcing and Supplying the Oil

Fielding the flamethrower meant securing a steady supply of petroleum, gathered from surface seeps and, in Sichuan, from early boreholes that reached oily strata. Storing and transporting the volatile fuel safely was itself a logistic craft, since a leaked cache could ignite by accident.

State workshops therefore managed fire oil as a controlled commodity, issuing it to units trained in its use. The weapon thus depended on a small supply chain—well, store, and crew—that marks it as an early example of fuel-dependent warfare rather than a mere battlefield trick.

Read against later weapons, the oil cabinet shows a continuous Chinese interest in projecting fire, from petroleum jets to gunpowder flames, a thread that runs through the whole history of the gunpowder age in China.

Though seldom decisive on its own, the flamethrower embodied an important lesson: that controlling a new and dangerous substance could decide battles, a principle later borne out many times over by gunpowder itself.

In the end, the fierce-fire oil cabinet earned its place less as a wonder weapon than as proof of Chinese ingenuity in turning a difficult natural substance into a controlled instrument of war.