Revelation 9:9 - Exposition

And they had breastplates, as it were breastplates of iron. Again, a natural feature of the locust is specifically alluded to, in order to portray the terrible nature of their appearance. The horny substance which appears behind the face of the locust is not unlike the plates of iron with which the breast and shoulders of war horses were protected. And the sound of their wings was as the sound of chariots of many horses running to battle; the sound of chariots, of many horses rushing to war (Revised Version). The sound of the two things together, viz. that of rushing horses, and that of the chariots which they draw. The same simile is used in Joel 2:5 .