Sir John Gilbert — The Morning of the Battle of Agincourt, 25th October 1415.↗
On October 25, 1415, a sick and outnumbered English army destroyed the French nobility in a few hours. Agincourt was not a miracle—it was the product of terrain, doctrine, and a technological gap the French refused to acknowledge.
French casualties at Agincourt: between 6,000 and 10,000 dead, including three dukes, nine counts, ninety barons, and 1,500 knights. English casualties: approximately 112 men-at-arms, unknown number of archers—total estimates rarely exceed 500. The disparity is so stark that contemporaries reached for divine explanation. The military historian reaches for a different answer: the physics of a ploughed field in October rain, and the terminal ballistics of a 32-inch war arrow at 150 meters.
Henry V positioned his men across a narrow front flanked by woods, forcing any French advance into a compressed killing zone. The field had been freshly ploughed and saturated with overnight rain. French men-at-arms in full plate armor—each kit weighing 50–60 pounds—advanced across 300 meters of this terrain before contact. By the time they reached the English line, they were exhausted, bunched, and ankle-deep in churned mud.
Henry's 5,000–6,000 archers were deployed in wedge formations on the flanks, angled to maximize enfilade fire. The English longbow at approximately 150 pounds draw weight sent bodkin-point arrows through plate armor at 100 meters. At Agincourt, the kill zone worked by accumulation: arrows struck exposed faces, horses, and piled up as physical mass that slowed and tripped men who could not rise once fallen. Six thousand archers at 10–12 arrows per minute maintained for 10 minutes equals 600,000–720,000 arrows into a compressed target zone.
As the main engagement ended, a French attack on the English baggage train prompted Henry to order the killing of prisoners—a decision that violated chivalric convention. The pragmatic explanation: Henry had more prisoners than guards, and re-armed prisoners at his rear was an existential threat. Agincourt was not a chivalric contest but a modern problem in force management.
Little, Brown, 2005
Viking Press, 1976
Pen & Sword, 2015
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