What does 2 Chronicles 35:20 mean?

After Josiah had restored the temple, Egypt's king, Neco, marched up to fight at Carchemish on the Euphrates River. Josiah went out to confront him. 2 Chronicles 35:20 - Modern Text Bible

(Josiah, after finishing his religious reforms, decides to face the Egyptian army, even though Egypt wasn't directly threatening Judah.)