“One woe is past, and behold there come yet two woes more hereafter. And the sixth angel sounded the trumpet:”
 … and I heard a voice from the four horns of the great altar, which is before the eyes of God,  Saying to the sixth angel, who had the trumpet: Loose the four angels, who are bound in the great river Euphrates.  And the four angels were loosed, who were prepared for an hour, and a day, and a month, and a year: for to kill the third part of men.
 And the number of the army of horsemen was twenty thousand times ten thousand. And I heard the number of them.  And thus I saw the horses in the vision: and they that sat on them, had breastplates of fire and of hyacinth and of brimstone, and the heads of the horses were as the heads of lions: and from their mouths proceeded fire, and smoke, and brimstone.  And by these three plagues was slain the third part of men, by the fire and by the smoke and by the brimstone, which issued out of their mouths.  For the power of the horses is in their mouths, and in their tails. For, their tails are like to serpents, and have heads: and with them they hurt.  And the rest of the men, who were not slain by these plagues, did not do penance from the works of their hands, that they should not adore devils, and idols of gold, and silver, and brass, and stone, and wood, which neither can see, nor hear, nor walk:
 Neither did they penance from their murders, nor from their sorceries, nor from their fornication, nor from their thefts. (Apocalypse Chapter 9, verses 13-21)
With the Sixth Angel’s Trumpet, we are introduced to the most severe chastisement so far. St. John himself seems to expect disbelief at the vastness of it, for when he announces that the army of horsemen numbers “20,000 times 10,000”, that is, 200,000,000, he quickly asserts, “And I heard the number of them”, thus confirming this number is from the Holy Ghost, and not his own conjecture.
The Great Altar is Christ our Savior, and it is He who commands the four fallen angels be released. That these angels are fallen is clear because they have been bound. That Jesus is allowing them to be free is evidence of His justice, which has been so long mocked with false mercy of hypocrites. The Great Altar emphasises Christ’s perfect sacrifice for us on Calvary and in the true Holy Sacrifice of the Mass. This vision is directly related to the abuses of the Mass, such as stripping it of its sacrificial nature, and the abuses of the faith, carried out by the leaders of the Church, those who are most called to protect, promote and defend the Faith.