What's the story of Charles III and the horse nail?

First, it's Richard III. There is no Charles III in Britain (although there may be = =) \x0d\x0d\ and then there is this popular folk song: \ x0d \ lost a nail and broke a shoe; Broke a shoe and a horse; Fold a horse and hurt a knight; Wounded a knight and lost a battle; Lost a battle and lost an empire \ x0d \ x0d \ tells the story that Richard III fell off his horse in the battle before Bosworth, which made the York army suffer a great defeat and the English throne changed hands. The meaning is probably similar to "a levee of a thousand miles was destroyed in an ant nest", and it can also be understood as "butterfly effect". \ x0d \ x0d \ Finally, the recent archaeological results prove that this story is false. Richard was very brave in this battle until his death.