When did England invade France in the Medieval era?
Edit: Dates :)
Regarding the English Longbow, there appears to be an ongoing debate regarding when the longbow was developed, as used in the Hundred Years War. There are some who argue that prior to the late thirteenth Century, English bows were either a shortbow or less powerful "ordinary bow."[2]
Others have argued much later. Unless we get an older find of Mary Rose quality, I think that debate will run on. :)
Archery definitely existed before that time, but that was not the same as the famous heavy longbow of the late Middle Ages.
Prior to that, Vikings, Norsemen. Lots of interchange over the channel.