The black horses which are there go forth into the north country; and the white go forth after them; and the dappled go forth toward the south country.
All Commentaries on Zechariah 6:6 Go To Zechariah 6
Richard Challoner
AD 1781
The land of the north: So Babylon is called; because it lay to the north in respect of Jerusalem. The black horses, that is, the Medes and Persians: and after them Alexander and his Greeks, signified by the white horses, went thither because they conquered Babylon, executed upon it the judgments of God, which is signified, ver. 8, by the expression of quieting his spirit.-- Ibid.