If the Median monarch would give his daughter Amuhia (or Amyitis) to be the wife of his son Nebuchadnezzar, the forces under his command should march against Nineveh and assist Cyaxares to capture it.

Such a proposition arriving at such a time was not likely to meet with a refusal.

Cyaxares gladly came into the terms; the marriage took place; and Nabopolassar, who had now practically assumed the sovereignty of Babylon, either led or sent a Babylonian contingent to the aid of the Medes.
The siege of Nineveh by the combined Medes and Babylonians was narrated by Ctesias at some length.

He called the Assyrian king Sardanapalus, the Median commander Arbaces, the Babylonian Belesis.

Though he thus disguised the real names, and threw back the event to a period a century and a half earlier than its true date, there can be no doubt that he intended to relate the last siege of the city, that which immediately preceded its complete destruction.