(the hill or city of Megiddo ). (Revelation 16:16) The scene of the struggle of good and evil is suggested by that battle-field, the plain of Esdraelon, which was famous for two great victories, of Barak over the Canaanites and of Gideon over the Midianites; and for two great disasters, the deaths of Saul and Josiah. Hence it signifies in Revelation a place of great slaughter, the scene of a terrible retribution upon the wicked. The Revised Version gives the name as Har-Magedon , i.e. the hill (as Ar is the city ) of Megiddo .--ED.)
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Smith, William, Dr. "Entry for 'Armaged’don'". "Smith's Bible Dictionary".