Dear Gareth, I'm quite sure there were some Welsh archers at Agincourt - but the vast majority were certainly English - they were collected from all over England. (There's a good pub in Derbyshire near where I was born where the local men are said to have gathered to go and join Harry's army.) I think it was Henry IV who made it compulsory for all Englishmen to practice archery on Sunday instead of playing ball games! Harry V wasn't Welsh either, only born at Monmouth,- the English Medieval monarchs used to move all over their possessions, which included Wales. Yet another attempt by the Celtic loony fringe to nick everything not actually nailed down!
   Anyway, if you 'get' Harry you also have to take responsiblity for that dreadful little fairy fart Edward II, who was born at Canarvon. Not to mention that tight-fisted humourless mass-murderer Henry VII, born at Pembroke!