Why Did England Win the Battle of Agincourt? The 1415 English Victory Explained

A Young King, an Old War When Henry V took the English throne in 1413, he inherited more than a crown; he inherited a war that had already been burning for nearly eighty years. The Hundred Years’ War — a tangled conflict of dynastic claims, feudal loyalties, and economic rivalry — had seen English and French kings trading victories and defeats across France since 1337. Edward III’s early triumphs at Crécy and Poitiers had carved out a continental empire for England; later setbacks had chipped it away. Henry was young, hungry, and convinced that the old claims were still valid. He insisted that the French crown owed him territory, back pay for past treaties, and the hand of Catherine of Valois, daughter of King Charles VI, on terms favorable to England. Diplomacy failed. The French court, divided between Burgundian and Armagnac factions and ruled by a king prone to bouts of madness, refused to give Henry what he wanted. In the summer of 1415, the young king chose the language Europe understood best: war. Harfleur: Victory at a Cost On 13 August 1415, Henry landed in Normandy with roughly 11,000 men — a mixed force of men-at-arms and thousands of archers armed with the English longbow. His first target was the port of Harfleur at the mouth of the Seine, a valuable foothold for future campaigns. The siege lasted more than five weeks. Harfleur eventually surrendered on 22 September, but the price was steep: disease, especially dysentery, ripped through the English camp, killing or incapacitating thousands. By the time the town fell, Henry’s effective army was roughly half what it had been — perhaps 6,000 men fit to fight, by some estimates. With autumn closing in and supplies running low, the obvious move was to garrison Harfleur and sail home. Henry chose a different course. He would march his weakened army across enemy territory to Calais — a bold trek through northern France, right under the nose of the French feudal host. The March to Calais The march was slow and miserable. French forces under Constable Charles d’Albret — the senior French commander on the field — shadowed the English, cutting off bridges and ford points along the Somme and trying to trap them before they could reach safety. On 19 October, Henry finally forced a crossing at a lesser-known ford, but his army paid for it in soaked clothes, ruined boots, and worsening sickness. The men were hungry, exhausted, and far from home. Four days later, French scouts reported that they had finally blocked Henry’s path near a small village called Agincourt (Azincourt in French), roughly 75 kilometers south of Calais. By the evening of 24 October, the two armies faced one another across a narrow, freshly ploughed field, hemmed in by thick woods. The French host, made up of nobles from across the realm, numbered perhaps 12,000–15,000 men; Henry’s force, by contrast, was likely only 6,000–8,000. To the French, it looked like the perfect chance to crush a weakened invader and end Henry’s adventure in a single, glorious charge. Henry saw something else in that muddy strip of land: a way to turn his weakness into strength. Wikipedia – Battle of Agincourt Britannica – Battle of Agincourt History.com – Battle of Agincourt World History Encyclopedia – Battle of Agincourt