“And they had brestplates, as it were brestplates of iron, and the sound of their wings was as the sound of charets of many horses running to battell.”
1611 King James Version (KJV)
9:9 And the noise of their wings was as the noise of chariots of many horses - With their war - chariots, drawn by many horses, they, as it were, flew to and fro.
Re 9:9 And they had breastplates, as it were breastplates of iron. There was something that seemed like an army clad in iron coats of mail. And the sound of their wings [was] as the sound of chariots. They gave a sound like the rush of chariots and horses rushing to battle.