Charles H. Spurgeon on Psalms 137:9

Against the stones. That elM signifies a rock, is undubitable, from the concurrent testimony of all the best Hebrew lexicographers. Hence it follows, because there is no rock, nor mountain, nor hill, either in tim city or in the province of ancient Babylonia, that the locality against which the malediction of this Psalm is hurled cannot be the metropolis of the ancient Assyrian empire, but must be apocalyptic Babylon, or Papal Rome, built upon seven hills, one of which is the celebrated Tarpeian Rock. But the eighth verse emphatically declares that the retributive justice of God will visit upon apocalyptic Babylon the same infliction which Assyrian Babylon, and also Pagan Rome, inflicted upon Jerusalem. As therefore Nebuchadnezzar as well as Titus "burnt the house of the Lord, and tim king's house, and all the houses of Jerusalem, and every great man's house burnt he with fire" (2Ki 25:9), so "the ten horns shall hate the whore, and shall make her desolate and naked, and shall eat her flesh, and burn her with fire; and she shall be utterly burned with fire" (Re 17:16 18:8). When the Canaanites had filled up the measure of their iniquity, Israel received a divine commission to exterminate the guilty nation. When Papal Rome shall have filled up the measure of her iniquity, then "a mighty angel will take up a stone, like a great millstone, and will cast it into the sea, saying, Thus with violence shall that great city Babylon be thrown down": "For her sins have reached unto heaven, and God hath remembered her iniquities. Reward her even as she rewarded you, and double unto her double according to her works: in the cup which she hath filled fill to her double" (Re 18:5-6). Then shall issue the divine proclamation: "Rejoice over her, thou heaven, and ye holy apostles and prophets; for God hath avenged you on her" (Re 18:20). —John Noble Coleman, in "The Book of Psalms, with Notes," 1863.