A Chinese Military Manual Records Gunpowder Formulas

Between 1040 and 1044, a team of Song dynasty scholars led by Zeng Gongliang compiled the Wujing Zongyao, an extensive military compendium commissioned by Emperor Renzong. The Song court sponsored the ambitious encyclopedic project partly in response to military conflict against the Western Xia kingdom, and partly because imperial leaders worried that civilian officials lacked adequate knowledge of classical military strategy. Zeng, an official rather than an active field general, worked alongside the astronomer Yang Weide and the scholar Ding Du to bring together traditional tactics, strategic doctrines, and operational technologies into a single reference work for imperial administrators. Emperor Renzong contributed a preface to celebrate its formal completion.

The resulting compilation surveyed an enormous range of military engineering, incorporating catapult mechanisms, defensive installations, and maritime vessels. The authors classified naval craft into six designated categories, including tower ships, combat junks, covered swoopers, flying barques, patrol boats, and sea hawk vessels. The manual's technical drawings of naval vessels subsequently shaped East Asian nautical texts for generations, appearing centuries later in works such as the seventeenth-century Chinese encyclopedia Wubei Zhi and eighteenth-century Japanese naval studies. Beyond naval design, the treatise preserved the oldest known diagram of a double-action dual-piston cylinder flamethrower, an apparatus capable of spraying a continuous stream of burning oil.