Ezekiel 38:20-21

Every living thing on earth would feel this earthquake, the sign of God’s presence. Mountains would fall down, as well as cliffs with their steep pathways, as would the walls that people had erected. Gog’s allied forces would even turn on each other and fight one another (cf. Judges 7:22; 1 Samuel 14:20; Haggai 2:22; Zechariah 14:13; Revelation 19:19-20). Apparently the sword that God would call for to defeat Gog would be that of his own allies rather than that of Israel (cf. Revelation 20:9).