No, the Kushites did not defeat the Assyrians. In fact, the Assyrians were one of the most powerful and dominant empires in Mesopotamia during the ancient times. The Kushites, who were based in the region of Nubia (present-day Sudan), did successfully resist Assyrian incursions and maintain their independence for a period of time. However, the ultimate decline of the Assyrian Empire was not directly caused by the Kushites. The Assyrians faced various challenges from different groups and eventually fell to the Neo-Babylonians in 612 BC.
