And the serpent cast out of his mouth water as a flood after the woman, that he might cause her to be carried away by the flood.
All Commentaries on Revelation 12:15 Go To Revelation 12
George Leo Haydock
AD 1849
The serpent (the dragon, the devil) came out of his mouth He endeavoured to destroy the Christian religion; but the earth, that is, the princes of the earth, as God was pleased to turn their hearts, helped to turn away the persecutions. (Witham)
As a last effort, the devil raises a more bloody persecution than was ever known before. See Eusebius, History of the Church.