The 11th-century Chinese military manual that first revealed the chemical secrets of gunpowder.

Art · Published 3 October 2026 Swipe more like this →

In short: Compiled between 1040 and 1044, the Wujing Zongyao served as a comprehensive guide for Song dynasty officials. Beyond its strategic advice, it provides the earliest known written formulas for gunpowder and detailed illustrations of advanced weaponry, including flamethrowers and various incendiary devices, shaping centuries of military technology and naval design.

Commissioned by Emperor Renzong of Song, the Wujing Zongyao was a response to the dynasty's ongoing conflict with the Tanguts of Western Xia. Chief editor Zeng Gongliang, working alongside astronomer Yang Weide and scholar Ding Du, aimed to consolidate military knowledge for government officials who lacked formal training. The resulting compendium was a massive undertaking, though historian Ralph D. Sawyer notes it relied heavily on existing, often anonymous, classical military texts.

The text is most famous for documenting the transition of gunpowder from an alchemical curiosity to a tactical weapon. While gunpowder was used as early as the 10th century, the Wujing Zongyao provides the first explicit chemical formulas, detailing precise ratios of saltpeter, sulfur, and charcoal. These mixtures powered a variety of devices, from fire arrows and smoke bombs to sophisticated incendiary projectiles launched by trebuchets. It also features the oldest known illustration of a double-action piston flamethrower, a device capable of projecting a continuous stream of fire.

Beyond explosives, the compendium captured the ingenuity of Song-era engineering. It describes the 'south-pointing fish,' a thermoremanence compass made of heated iron, and provides a typology of six warship categories that influenced naval handbooks for centuries. Despite its importance, the original manuscript was lost during the 1126 sacking of Kaifeng. The version known today, considered by Joseph Needham to be the most faithful to the 1231 edition, was printed in 1510. This survival is a testament to the book's secretive nature, as it was restricted to a small circle of government trustees to prevent its advanced knowledge from falling into enemy hands.

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