I suggest to read this topic and watch its video about western European (it means British Isles and France) armor and archery. Advanced high quality medieval plate armours (plate hardening techology) and metallurgy were produced only in northern Italy and Southern German territories. The victories of the longbowmen were only possible because of the backward Western European (French and English) metallurgy.
Was the Agincourt victory possible because of backward Western armors and metallurgy?
Was the Agincourt victory possible because of backward Western armors and metallurgy?