Well the Longbow is the most iconic weapon of the Medieval Period. It is also the center of a great debate, admittedly friendly, between two of best Medieval Military Historians in the United States. Cliford J. Rogers at West Point take a very Orthodox position defending the longbow as the decisive weapon in the Hundred Years War. Kelly DeVries, you have probably seen him on the history channel, but he is also a professor at Loyola University in Baltimore. It is well worth the watch but set aside some time if you do because it has eleven parts and will take most of two hours to watch. If you have any interest in Medieval Warfare it is well worth though.