Footnote
b The author and Bible translator, Hugh J. Schonfield, identifies Har–Magedon (Armageddon) with Ramoth-Gilead, possibly known in John’s day as Rama-Gad-Yavan, meaning “Rama of Gad of the Greeks,” the place Gad-Yavan being mentioned in the Jewish Mishnah of the second century.—See pages 181-184 of his book The Bible Was Right; also the comment on Revelation 16:16, on page 546 of his translation The Authentic New Testament.
At any rate, Schonfield associates Armageddon with Jewish territory, although east of the Jordan River, in the aforetime territory of the tribe of Gad. He does not locate it near the Euphrates.