=Josiah's Reign.= In Josiah the reformers found an energetic leader. It was during his reign that the Scythian hordes poured down from southeastern Europe. Some of these wild barbarians swept down the eastern coast of the Mediterranean, giving Zephaniah and Jeremiah the texts of their earlier sermons. Others, turning to the east, flung themselves against the Assyrian empire and ultimately, in union with the Babylonians, succeeded in conquering Nineveh itself. The impending fall of Assyria favored the work of the reformers, so that in 621 B.C. the prophetic law-book was brought from the temple and publicly adopted by Josiah in behalf of the people. The record of the institution of this new law indicates that Josiah's authority extended beyond the old bounds of Judah. After the withdrawal of the Assyrian governors it was natural that the surviving tribes of the north should again look to Jerusalem for political and religious leadership. This fact explains why Josiah's last fatal battle was fought against the Egyptian king, Necho, in the vicinity of the old Canaanite fortress of Megiddo. =The Brief Rule of Egypt.= Necho, the son of Psamtik I, a Libyan who had succeeded in conquering Egypt, was inspired by the oft-recurring ambition to recover the Asiatic possessions once held by the empire. The approaching fall of Assyria gave him a favorable opportunity. With the aid of the Greek mercenaries in his service, he succeeded in conquering the Philistine cities. The defeat of Josiah at Megiddo in 608 B.C. gave him practical possession of Palestine. In the same way the different states of Syria fell before him, so that between 608 and 605 B.C. he was master of the eastern Mediterranean. This brief Egyptian rule, however, was overthrown by the new Chaldean kingdom, which arose in lower Babylonia and, after the fall of Nineveh, quickly fell heir to the southern and western part of the Assyrian empire. The decisive battle between the Egyptians and Chaldeans was fought at Carchemish, by the Euphrates, in 605 B.C. and resulted in the complete defeat of Necho's army. The Egyptians were speedily driven from Syria and Palestine and the Chaldean authority established in their stead.