How Did The Assyrian King Replace Pharaoh Necho II?

Ashur-uballit II, the Assyrian king, required the help of his ally, Pharaoh Necho II of Egypt and his army, to support him during the attack on Babylon. Thus Pharaoh lead his army to meet with the Assyrian forces, however, Josiah delayed his trek and attacked his army in Megiddo. And although Pharaoh defeated him, he was able to decrease the size of his force significantly. Necho continued his journey, but he was attacked again! Yet now by the army of Babylon, lead by King Nebuchadnezzar. The King defeated Pharaoh Necho II so brutally that in the Nebuchadnezzar Chronicle it states, “He accomplished their defeat and beat them to non-existence. As for the rest of the Egyptian army which had escaped from the defeat so quickly that no weapon had