"See the old Dragon from his throne
Sink with enormous ruin down!"
The attribution Cordell provides is merely 'Hymn'. In years past I might have never located the hymn from which these lines were taken, but, thanks to the power of the Internet (I simply typed in, as a quotation, the first line of the epigraph into Google search), I discovered that one source for the hymn is the third volume of the Works of the Rev Phillip Doddridge.
The Rev Doddridge, who wrote the hymn based on the passage from Revelation 12.11 ('But they have conquered him [i.e., the Devil, the dragon] by the blood of the Lamb and by the word of their testimony, for they did not cling to life even in the face of death.'). Doddridge's work The Rise and Progress of Religion in the Soul influenced William Wilberforce to become a Christian (so Wikipedia). Doddridge himself is a somewhat obscure figure. His online presence is largely limited to his Wikipedia article and some online hymn sites.
I am not sure where Cordell discovered these lines of the hymn; I should ask him one of these days.