New technologies improved the weapons used in war, making castles and knights useless.
During the Hundred Years' War, several chivalric orders were formed, to which nobles and knights were admitted. The most famous is the Order of the Garter, which was established by Edward III following the Battle of Crécy. Knighthood is strongly linked to a code of chivalrous behaviour and military professionalism.
The war destroyed much of France and caused enormous suffering; it virtually destroyed the feudal nobility, ushering in a new social order. By ending England's status as a continental power, the English were able to expand their reach and power at sea.
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