Originally Posted by Ninja of Cao
The samurai longbows, the Yumi, could be fired from horseback and would pierce right through a human body without armor and definately penetrate even an iron breastplate.
Also, the Mongols successfully used mounted archers against fully equipped European knights in the 1200's.
Human body is not armor, not even close
The also baked the knights in the middle of the plains, and forced the knights to take of there armor.