Zechariah 14:3
"Then shall the LORD go forth, and fight against those nations, as when he fought in the day of battle."
Cross References (ranked by relevance)
And it shall come to pass in that day, that I will seek to destroy all the nations that come against Jerusalem.
Behold, at that time I will undo all that afflict thee: and I will save her that halteth, and gather her that was driven out; and I will get them praise and fame in every land where they have been put to shame.
And he said, Hearken ye, all Judah, and ye inhabitants of Jerusalem, and thou king Jehoshaphat, Thus saith the LORD unto you, Be not afraid nor dismayed by reason of this great multitude; for the battle is not yours, but God’s.
I will also gather all nations, and will bring them down into the valley of Jehoshaphat, and will plead with them there for my people and for my heritage Israel, whom they have scattered among the nations, and parted my land.
And all these kings and their land did Joshua take at one time, because the LORD God of Israel fought for Israel.