Sennacherib's grandson, Assurbanipal (called by the Greeks Sardanapalus), did succeed in conquering and for a time holding lower Egypt.
The Assyrian Empire lasted only a hundred and fifty years after Sargon II. Fresh nomadic Semites coming from the south-east, the Chaldeans, assisted by two Aryan peoples from the north, the Medes and Persians, combined against it, and took Nineveh in 606 b.c.
The Chaldean Empire, with its capital at Babylon (Second Babylonian Empire), lasted under Nebuchadnezzar the Great (Nebuchadnezzar II) and his successors until 539 b.c., when it collapsed before the attack of Cyrus, the founder of the Persian power....
So the story goes on. In 330 b.c., as we shall tell later in some detail, a Greek conqueror, Alexander the Great, is looking on the murdered body of the last of the Persian rulers.
The story of the Tigris and Euphrates civilizations, of which we have given as yet only the bare outline, is a story of conquest following after conquest, and each conquest replaces old rulers and ruling classes by new; races like the Sumerian and the Elamite are swallowed up, their languages vanish, they interbreed and are lost, the Assyrian melts away into Chaldean and Syrian, the Hittites become Aryanized and lose distinction, the Semites who swallowed up the Sumerians give place to Aryan rulers, Medes and Persians appear in the place of the Elamites, the Aryan Persian language dominates the empire until the Aryan Greek ousts it from official life. Meanwhile the plough does its work year by year, the harvests are gathered, the builders build as they are told, the tradesmen work and acquire fresh devices; the knowledge of writing spreads, novel things, the horse and wheeled vehicles and iron, are introduced and become part of the permanent inheritance of mankind; the volume of trade upon sea and desert increases, men's ideas widen, and knowledge grows. There are set-backs, massacres, pestilence; but the story is, on the whole, one of enlargement. For four thousand years this new thing, civilization, which had set its root into the soil of the two rivers, grew