Why is the Battle at Agincourt during the Hundred Years’ War significant in military history?

Answer 1

The Battle of Agincourt was a seminal moment in the histories of both France and the UK as it would decisively affect the trajectory of the initial stages of the Hundred Years War by opening Medieval France to the spread of English influence that would remain largely unchallenged until the Battle of Orleans decades later. Its significance for military history is found in how conventional contemporary warfare would change following the battle, lessening the influence of armies organized around warring nobles, while exposing the inherent weaknesses of heavy cavalry forces in an ever complex world of military tactics and organization. The success of English yeoman archers during this battle would hasten the development of professional European armies that would culminate in France's Grande Armee a few centuries later.