2 Chronicles 34:7

And when he had broken down the altars and the groves, and had beaten the graven images into powder, and cut down all the idols throughout all the land of Israel, thus removing all evidences of idolatrous practices as far as his authority extended, he returned to Jerusalem. Note that Josiah did not attempt, to get the people of the northern part of Canaan away from their allegiance to the Assyrian kings, but confined himself strictly to the destruction of idolatry.