It's covered: "The longbow took years of continuous training to master. Not only was there the matter of the physical strength necessary to draw 120-plus pound

It's covered: "The longbow took years of continuous training to master. Not only was there the matter of the physical strength necessary to draw 120-plus pounds with one arm over and over again, but because the longbow arrow was drawn to the ear, aim was largely a matter intuition rather than sight. Thus, if war erupted, it was not possible to recruit a company of men untrained on the longbow and train them to use the weapon quickly. A stock of proficient archers had to already be in place, prepared to serve."