Zechariah 6:1-15

God has promised throughout this scripture that Israel will return, be powerful, and occupy that particular land. Zechariah is receiving visions and Chapter 6 wraps up the visions that have to do with Zechariah's time.
Vs1: 4 chariots, 2 mountains, mountains made of brass. Brass in scripture always represents judgement. The 2 mountains are probably Mount Zion and Mount Olive, but we don't know for sure.
Vs2-3: red, black, white, and grisled (speckled) and bay (strong and powerful) horses lead the individual chariots. Grisled means speckled. These are angels coming out of the mountains ready for judgement.
Zechariah 1:8 the man on the black horse under the myrtle trees, and behind him were men on three other horses, one red, white, and grisled. These are the exact same group of angels.
Vs4-6: These are spirits that stand before God's throne, doing God's work. They are sent to the North and the South to do some work. To the east is the desert, and to the west is the Mediterranean Sea, so they are sent to populated areas, walk around the earth.
Vs8: The North Country quieted his spirit, but not the South Country. The worst prosecution of Israel has come from the North Country (Babylon). They catch the worst of the judgement. The economic and religious system all combined.
Rev 6: the four horsemen of the apocalypse and these probably represent the same horses mentioned here.