The people who used longbows were peasants and yeomen and other people further down the social scale.
In the French army these people were disregarded and given very little role in battles.
In the English army, they were used with great effectiveness to kill enormous numbers of French knights.
And particularly at The Battle of Crecy. The French armored knights attacked the English armored knights, but the English had longbowmen, and they massacred the French and it was a very lopsided battle.