There is an old saying: Without nails, there are no iron hoofs. Without iron hoofs, there are no good horses. Without good horses, there is no way to deliver letters.

It probably means that things are connected and interconnected. One small thing may determine the success or failure of the entire thing, even though it may seem irrelevant. There is an old saying: if a nail is lost, an iron shoe is broken. If an iron shoe is broken, a war horse is broken. If a war horse is broken, a knight dies. If a knight dies, a war is lost. A war is lost. A war destroyed a country. It means that small things can lead to big mistakes.