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

The battle of Agnicourt changed the martial balance of power between the nobility and the yeomen which made it very important.

Explanation:

Battle of Agincourt, (October 25, 1415), conclusive fight in the Hundred Years' War (1337-1453) that brought about the triumph of the English over the French. The English armed force, drove by King Henry V, broadly accomplished triumph regardless of the numerical predominance of its opponent.

The Battles of Crécy, Poitiers and Agincourt changed the military perceived leverage between the honorability and the yeomen, or laborer ranchers who employed the longbow. The possibility that quality and expertise could triumph over riches and status was a progressive one.