Jamieson, Fausset and Brown on Zechariah 14:2

2. gather all nations, &c.--The prophecy seems literal (compare Joe 3:2). If Antichrist be the leader of the nations, it seems inconsistent with the statement that he will at this time be sitting in the temple as God at Jerusalem (2Th 2:4); thus Antichrist outside would be made to besiege Antichrist within the city. But difficulties do not set aside revelations: the event will clear up seeming difficulties. Compare the complicated movements, Da 11:1-45.

half ... the residue--In Zec 13:8, 9, it is "two-thirds" that perish, and "the third" escapes. There, however, it is "in all the land"; here it is "half of the city." Two-thirds of the "whole people" perish, one-third survives. One-half of the citizens are led captive, the residue are not cut off. Perhaps, too, we ought to translate, "a (not 'the') residue."