Revelation 9:9-13

They had breastplates like breastplates of iron; and the sound of their wings was like the sound of chariots, of many horses rushing to battle.

They have tails like scorpions, and stings; and in their tails is their power to hurt people for five months.

They have as king over them, the angel of the abyss; his name in Hebrew is Abaddon, and in the Greek he has the name Apollyon.

The first woe has passed; behold, two woes are still coming after these things. The Sixth Trumpet: Army from the East

Then the sixth angel sounded, and I heard a voice from the four horns of the golden altar which is before God,