The Battle of Agincourt was an English victory in the Hundred Years' War. It took place on 25 October 1415 near Azincourt, in northern France. The unexpected English victory against the numerically superior French army boosted English morale and prestige, crippled France and started a new period of English dominance in the war.
After several decades of relative peace, the English had resumed the war in 1415 amid the failure of negotiations with the French. In the ensuing campaign, many soldiers died from disease, and the English numbers dwindled; they tried to withdraw to English-held Calais but found their path blocked by a considerably larger French army. Despite the numerical disadvantage, the battle ended in an overwhelming victory for the English.
Wikipedia https://en.wikipedia.org/wiki/Battle_of_Agincourt
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Coordinates 50°27'14.739" N 2°9'4.591" E