tl;dr: The abstract does a wonderful job. It is will worth reading. Longbow was cheap and technically superior, but required training. Crossbow more expensive, required less training. Rulers of England less worried about rebellion, OK to invest in training. Rulers of France/Scotland not so happy because of fear to give potential of overthrow to the people (Scotland not in title, but in article along with France). Per…
If I remember correctly (and I'm still looking for a better source than this[1]), the Duke Of Wellington had requested a corps of longbowmen be made ready for use against the French in the Napoleonic wars, but was advised that no one with the skill needed to train them still existed (the training being the most difficult part of the technology). The last use of trained english longbowmen seemed to have been by some o…
It happens quite regularly. Military forces have to adapt to the problem of the day.