Thou didst walk through the sea with thine horses,.... And as thou didst of old, so do again; as Jehovah walked through the Red sea in a pillar of cloud and fire, which were his horses and chariots, and destroyed the Egyptians; so may he walk through another sea by his instruments, and destroy the enemies of his church and people; See Gill on "Hab 3:8".
The "sea" here signifies the world, compared to it for the multitude of its people; the noise, fluctuation, and uncertainty of all things in it; and particularly the Roman empire, the sea out of which the antichristian beast arose, Re 13:1.
The "horses" are the angels or Christian princes, with whom the Lord will walk in majesty, and in the greatness of his strength, pouring out the vials of his wrath on the antichristian states:through the heap of many waters; or "the clay", or "mud of many waters" ; that lies at the bottom of them; which being walked through and trampled on by horses, is raised up, and "troubles" them, as the Septuagint and Arabic versions render it: these "many waters" are those on which the whore of Rome is said to sit; and which are interpreted of people, multitudes, nations, and tongues,Re 17:1 and the "mud" of them is expressive of their pollution and corruption, with her false doctrines, idolatry, superstition, and immoralities; and of their disturbed state and condition, through the judgments of God upon them, signified by his horses walking through them; trampling upon them in fury; treating them with the utmost contempt; treading them like mire and clay, and bringing upon them utter ruin and destruction.