The connection between nails and horseshoes, horseshoes and war horses, war horses and knights, and war and the rise and fall of the country fully proves that everything has one way or another connection with the surrounding things, which embodies the universality of the connection.

Folk lyrics: nails are gone, shoes are removed; Unload shoes and horses; War horse, knight; Knights, war breaks; The war broke down and the country was destroyed.

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This ballad comes from the fact that the late King Richard of England abdicated. He was defeated in the Persian Battle of 1485. And Shakespeare's famous sentence: "Horse, horse, one horse loses the country" makes this battle go down in history forever, and also tells us that although it is only a nail that is not well prepared, it brings great danger.