Horse shoes? Tied on not nailed?

[RUBICON]

During the Migration Period conscious animal breeding seems to have been abandoned although movements of peoples spread the horses to a uniform population emerged. Toward the end of this period, conscious horse breeding began again and the first large, heavy, 'cold-blooded' western horses appeared. They were thick-legged horses bred for war purposes as knights began to wear heavy armor. The first horse shoes appeared at the same time (9th-10th cent. AD) since the weak hooves of these animals required shoeing, which the eastern horses did not.


Hmm maybe we have our facts wrong