The book of prophecies against the heathen (Isa. 13-23) begins with two remarkable chapters (xiii. 1-xiv. 23) declaring the imminent destruction of Babylon by the Medes, whom the prophet sees already in motion against the doomed city, and exulting over the descent of the king of Babylon to hell, greeted by the taunts of the mighty of the earth who were before him there. The two prophecies are connected by a prediction of the deliverance of captive Israel, which will be restored to its own land and rule over its oppressors (xiv. 1-4^a). The situation is not that of Isaiah's time, in which Babylon was a province of the Assyrian empire, and when, under Merodach Baladan, it for a while reasserted its independence, seems to have sought an alliance with Hezekiah against their common oppressor, Assyria (Isa. 39 = 2 Kings xx. 12 ff.). The Medes had been in league with the Babylonians against Assyria until its fall in 606 B.C.; it was not until the time of Cyrus that the Medes became a menace to Babylonia, and only after Cyrus's conquest of Lydia (546 B.C.) that the turn of Babylon was visibly come. On the other hand, the sack and ruin of Babylon, pictured with vengeful satisfaction in Isa. 13, did not come to pass at that time. The Persian armies, after a decisive battle in northern Babylonia, entered the city in the autumn of 538 without resistance. Babylonian inscriptions acclaim Cyrus as a deliverer, and Babylon became one of the capitals of his great empire. On these grounds the prophecy is generally thought to fall between 546 and 538 B.C. It is immediately followed by a short oracle (Isa. xiv. 24-27) against the Assyrians, quite in the tone of the prophecies of Isaiah in the time of Sennacherib (701 B.C.), and by an enigmatical warning to the inhabitants of the Philistine cities, said in the title to have come "in the year that King Ahaz died." Another prophecy concerned with the inhabitants of these cities, bearing Isaiah's name and definitely dated (711 B.C.), is Isa. 20. Chapter 17, entitled "The Burden of Damascus," is in fact chiefly against the kingdom of Israel, and falls in line with prophecies of Isaiah in the time of the alliance of the two kingdoms against Judah (ca. 736 B.C.); compare Isa. 7. In Isa. xxii. 15-25 is a prophecy of Isaiah singular in the fact that it is launched at an individual, the major domo of King Hezekiah.