My post above mentions that bows were believed to be introduced to Britain by the Normans (after 1066), however I just watched a program on the Saxons who drove the Britons westward during the 5th century.
A king (mythical?) Ambrosius Aurelianus made a stand at Mount Badon (Mons Badonicus) near what is now Bath, and one his warriors was supposedly Arthur (who may be the basis of the legendary Arthur). Anyway, the program showed the Britons using bows and arrows - 600 years before the Normans.
http://en.wikipedia.org/wiki/Battle_of_Mons_Badonicus
http://en.wikipedia.org/wiki/Bath,_Somerset#Post-Roman_and_Saxon
The Britons apparently learned archery from the Romans.
Or did each invading tribe introduce its own version of archery.
Now it's interesting that the Romans and Greeks knew archery, and the Huns also were excellent archers. Other tribes tended to favor spears, clubs/maces, hammers, or swords. I am starting to think that northern tribes (surrounded by coniferous forests) seem to have favored spears, hammers or swords, whereas southern tribes (surrounded by deciduous trees) employed bow and arrow, in addition to sword and spear.
On the other hand, I could be totally wrong on this -
The Romans owed much of their military superiority to armies of skilled archers, but at the beginning of the medieval period they were in turn defeated by the more highly skilled archers of the Goths, Huns, and Vandals.
During the Middle Ages the most notable European archers were the English. Medieval ballads celebrate their feats with the longbow in hunting, fighting, and, for the first time in recorded history, sport. Outside Europe, in the same period, peoples of the Middle East excelled in archery. Accounts of European travelers during the Renaissance indicate that the bow and arrow was the most important weapon used throughout the Far East, the Americas, Central Africa, and the Arctic regions.
http://www.history.com/encyclopedia.do?articleId=201396
The Romans were certainly in Briton before the Saxons.
So did the Celts bring archery to England?
Hmmmm.
Anyway - this is interesting -
http://www.atarn.org/chinese/scythian_bows.htm
The Scythian bow is like that of the Huns - with the ends folded away from the archer which required a shorter draw. The Huns didn't have to stand braced on the ground, but could rapidly fire from horseback which gave them a tactical advantage in battle.