Revelation 9:8

And they had breastplates like breastplates of iron, and the sound of their wings was like the sound of chariots with many horses running into battle.

·        Breastplates: Iron speaks of durability in battle (like the other demons in Rev. 9:17).

·        Wings: Sound of chariots running into battle will cause terror.  (CS)

Joel 2:4-5 Their appearance is like the appearance of horses; and like swift steeds, so they run.  With a noise like chariots over mountaintops they leap, like the noise of a flaming fire that devours the stubble, like a strong people set in battle array.

Job 20:24  He will flee from the iron weapon; a bronze bow will pierce him through.