After completing his prophecies concerning the people of Israel, he foretells what will happen to the other nations, teaching that he is Creator, God and Lord of all. First, he recounts those things that pertain to Egypt and teaches the time of this prophecy. The prediction was fulfilled after the death of the pharaoh Neco. Neco killed Josiah by the Euphrates River and was himself killed by the king of the Babylonians.
Source: ON JEREMIAH 9:46