I don't think you can compare that equipment to todays. I also don't think those bows were in inferior to todays 70# bows. It took a bow to push that arrow through that door and I don't think my 70# would, with any arrow.
Thanks for the history stuff. I always find archery history interesting. I once read that the typical draw weights on indian bows at the battle of the little big horn were 90 to 100 pounds. I think the biggest difference between then and now are the archers. Back in time little boys grew up shooting a bow. Sometimes there life depended on how good they were. They shot them all the time. Much of Englands success in battle depended on the prowess of its archers. Draw weights were incredibly high relative to today's archers. Very few of us could draw the bow of a boy from prior era's.