The English military ascendancy which lasted from the mid-14th to the early 16th century was founded upon defensive tactics based on the use of the longbow. This weapon, distinctive in that it was used by English forces alone, was probably the most effective missile weapon of the Late Middle Ages: its arrow had the same penetrative ability as a modern day bullet and the bow's rate of fire was not equalled by any weapon used by English forces until the adoption of the Lee Enfield rifle at the beginning of the 20th century. The English longbowmen's involvement in wars such as the War of the Roses (1455-1485) and One Hundred Years' War (1337-1453) is discussed.