Revelation 9:9

King James Version (KJV)

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.

Adam Clarke
Bible Commentary

They had breastplates - of iron - They seemed to be invulnerable, for no force availed against them.

The sound of their wings - Their hanging weapons and military trappings, with the clang of their shields and swords when they make their fierce onsets. This simile is borrowed from Joel 2:5-7.

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Albert Barnes
Notes on the Whole Bible

And they had breastplates, as it were breastplates of iron - Hard, horny, impenetrable, as if they were made of iron. The locust has a firm and hard cuticle on the forepart of the breast, which serves for a shield or defense while it moves in the thorny and furzy vegetation. On those which John saw this was especially hard and horny, and would thus be well adapted to be an emblem of the breastplates of iron commonly worn by ancient warriors. The meaning is, that the warriors referred to would be well clad with defensive armor.

And the sound of their wings was as the sound of chariots of many horses running to battle - The noise made by locusts is often spoken of by travelers, and the comparison of that noise with that of chariots rushing to battle, is not only appropriate, but also indicates clearly what was symbolized. It was an army that was symbolized, and everything about them served to represent hosts of men well armed, rushing to conflict. The same thing here referred to is noticed by Joel Joel 2:4-5, Joel 2:7;

“The appearance of them is as the appearance of horses;

And as horsemen so shall they run.

Like the noise of chariots on the tops of mountains, shall they leap;

Like the noise of a flame of fire that devoureth the stubble;

As a strong people set in battle array.

They shall run like mighty men;

They shall climb the wall like men of war;

And they shall march every one his ways,

And shall not break their ranks,” etc.

It is remarkable that Volney, who had no intention of illustrating the truth of Scripture, has given a description of locusts, as if he meant to confirm the truth of what is here said. “Syria,” says he, “as well as Egypt, Persia, and almost all the south of Asia, is subject to another calamity no less dreadful (than earthquakes); I mean those clouds of locusts so often mentioned by travelers. The quantity of these insects is incredible to all who have not themselves witnessed their astounding numbers; the whole earth is covered with them for the space of several leagues. The noise they make in browsing on the trees and herbage may be heard to a great distance, and resembles that of an army foraging in secret” (Travels in Egypt and Syria, vol. i. pp. 283,284).

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Uriah Smith
Daniel and the Revelation, 477

Verse 9

The Breastplate. — “The cuirass (or breastplate) was in use among the Arabs in the days of Mohammed. In the battle of Ohud (the second which Mohammed fought) with the Koreish of Mecca (A. D. 624), ‘seven hundred of them were armed with cuirasses.’”DAR 477.6

The Sound of their Wings. — “The charge of the Arabs was not, like that of the Greeks and Romans, the efforts of a firm and compact infantry; their military force was chiefly formed of cavalry and archers. With a touch of the hand, the Arab horses darted away with the swiftness of the wind. “The sound of their wings was as the sound of chariots of many horses running to battle.” Their conquests were marvelous both in rapidity and extent, and their attack was instantaneous. Nor was it less successful against the Romans than the Persians.”DAR 477.7

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Matthew Henry
Concise Bible Commentary

Upon sounding the fifth trumpet, a star fell from heaven to the earth. Having ceased to be a minister of Christ, he who is represented by this star becomes the minister of the devil; and lets loose the powers of hell against the churches of Christ. On the opening of the bottomless pit, there arose a great smoke. The devil carries on his designs by blinding the eyes of men, by putting out light and knowledge, and promoting ignorance and error. Out of this smoke there came a swarm of locusts, emblems of the devil's agents, who promote superstition, idolatry, error, and cruelty. The trees and the grass, the true believers, whether young or more advanced, should be untouched. But a secret poison and infection in the soul, should rob many others of purity, and afterwards of peace. The locusts had no power to hurt those who had the seal of God. God's all-powerful, distinguishing grace will keep his people from total and final apostacy. The power is limited to a short season; but it would be very sharp. In such events the faithful share the common calamity, but from the pestilence of error they might and would be safe. We collect from Scripture, that such errors were to try and prove the Christians, 1Co 11:19. And early writers plainly refer this to the first great host of corrupters who overspread the Christian church.

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