Zechariah 14:3-4

14:3 Then the Lord will go to battle ¹  and fight against those nations, just as he fought battles in ancient days. ²  14:4 On that day his feet will stand on the Mount of Olives which lies to the east of Jerusalem, and the Mount of Olives will be split in half from east to west, leaving a great valley. Half the mountain will move northward and the other half southward. ³ 

[14:3]  ¹ sn The statement the Lord will go to battle introduces the conflict known elsewhere as the “battle of Armageddon,” a battle in which the Lord delivers his people and establishes his millennial reign (cf. Joel 3:12, 15-16; Ezek 38–39; Rev 16:12-21; 19:19-21).

[14:3]  ² tn Heb “as he fights on a day of battle” (similar NASB, NIV, NRSV).

[14:4]  ³ sn This seismic activity provides a means of escape from Jerusalem so that the Messiah (the Lord), whose feet will stand on the Mount of Olives, may destroy the wicked nations in the Kidron Valley (the v. of Jehoshaphat, or of “judgment of the Lord”) without harming the inhabitants of the city.