Are you retarded? If you knew anything about history you'd know that the reason cavalry have been so feared throughout history is that horses, being subterranean animals, are extremely adept at digging. This made it possible for knights on horseback to disappear underground and launch themselves up behind enemy lines inflicting massive damage. Do yourself a favor and read a book every once in a while.
Does the knight on the chessboad jump over pieces or is the knight actually digging it's way under them?