Gunpowder Reaches Europe

Sometime in the thirteenth century, Europeans first wrote down a recipe for gunpowder, the Chinese invention that would eventually reshape warfare, politics, and the balance of power across the continent. The English Franciscan friar Roger Bacon is traditionally credited with the earliest European description, and the date of 1242 is often attached to it, though that year is a convenient marker rather than a firmly documented one. Historians generally agree only that the knowledge arrived in Europe around the middle of the century.

Gunpowder had been developed in China, probably by the ninth century, where alchemists experimenting with saltpeter, sulfur, and charcoal produced a flammable mixture. By the tenth and eleventh centuries it was being used in fire arrows, incendiary devices, and early bombs. How the knowledge traveled west is not well documented. The Mongol conquests, which linked East Asia with the Islamic world and eastern Europe in the thirteenth century, are a likely route, as are trade networks across Central Asia and the Middle East. Arabic writers were describing saltpeter and gunpowder-like compounds around the same period, and some European authors may have drawn on that tradition.

Bacon was a scholar at Oxford and Paris who championed experiment and the study of nature. His writings contain a coded or obscured passage that seems to refer to a mixture of saltpeter, charcoal, and sulfur, and he mentions its explosive effects, which he compared to thunder and lightning. He appears to have been interested in it as a curiosity of natural philosophy rather than a weapon, and scholars still debate how much of the formula he understood, and whether the passage was his own discovery or borrowed knowledge. His account was not a practical manual, and the first clear European recipes with usable proportions appeared later, in the late thirteenth and fourteenth centuries.

The consequences unfolded slowly. Cannon appear in European records and illustrations by the 1320s, and by the Hundred Years' War in the fourteenth and fifteenth centuries, gunpowder artillery was being used in sieges and, increasingly, in battle. Early guns were unreliable and sometimes as dangerous to their operators as to the enemy, but they improved steadily. By the fifteenth century, large cannon could batter down walls that had protected towns and castles for generations, as at the fall of Constantinople in 1453.

Over the following centuries, gunpowder weapons helped undermine the dominance of armored knights, favored states wealthy enough to field artillery and trained infantry, and contributed to the rise of centralized monarchies. Handheld firearms eventually replaced the bow and pike on most battlefields. The modest note of a thirteenth-century friar thus stands near the start of a technological shift that helped end the medieval military order.