I cannot help with „H. Mills“ but would like to hint at older editions of this book:
2nd edition: https://books.google.de/books?id=Jyk-AAAAcAAJ (year: 1839)
4th edition: https://books.google.de/books?id=Tlq5k0edlOwC (year: 1842, according to google)

Martin

Thanks, I see now I have those on here already but missed it for the sake of the change of word in the title;

https://www.brethrenarchive.org/bookshelf/books-and-pamphlets/unknown-author/the-second-appearing-and-personal-reign-of-the-lord-jesus-christ-a-discourse-on-thy-kingdom-come-matt-vi10/