New Living Translation
They wore armor made of iron, and their wings roared like an army of chariots rushing into battle.

American Standard Version
And they had breastplates, as it were breastplates of iron; and the sound of their wings was as the sound of chariots, of many horses rushing to war.

Berean Study Bible
They also had thoraxes like breastplates of iron, and the sound of their wings was like the roar of many horses and chariots rushing into battle.

Douay-Rheims Bible
And they had breastplates as breastplates of iron, and the noise of their wings was as the noise of chariots and many horses running to battle.

English Revised Version
And they had breastplates, as it were breastplates of iron; and the sound of their wings was as the sound of chariots, of many horses rushing to war.

King James Bible
And they had breastplates, as it were breastplates of iron; and the sound of their wings was as the sound of chariots of many horses running to battle.

World English Bible
They had breastplates, like breastplates of iron. The sound of their wings was like the sound of chariots, or of many horses rushing to war.

Young's Literal Translation
and they had breastplates as breastplates of iron, and the noise of their wings is as the noise of chariots of many horses running to battle;

Revelation 9:9 Additional Translations ...