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In 1415, a smaller, exhausted, disease-weakened English army under Henry V faced a much larger French force at Agincourt — and won decisively, largely thanks to a weapon the French badly underestimated: the English longbow.
Terrain that trapped the French advance
Recent rain had turned the battlefield into thick mud, and the narrow field flanked by woods funneled the French cavalry and infantry into a crowded mass that longbow volleys and the constrained terrain itself made devastatingly difficult to maneuver.
The longbow’s real advantage
English longbowmen could fire far faster than French crossbowmen, and massed volleys devastated advancing French knights before they closed to melee range — a weapon requiring years of training to use effectively, which limited who could field it at scale.
A famous underdog victory with real consequences
Agincourt didn’t win the war outright, but it devastated the French nobility’s fighting ranks and became a defining moment in English national memory, later immortalized by Shakespeare’s Henry V.

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The battle remains a textbook case study in how terrain, weapon technology, and command decisions can overturn a massive numerical disadvantage.
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