Now, just as in the eighth century there had risen, contemporaneous with Israel’s social corruption, a cloud in the north, black and pregnant with destruction, so was it once more. But the cloud was not Assyria. From the hidden world beyond her, from the regions over Caucasus, vast, nameless hordes of men arose, and, sweeping past her unchecked, poured upon Palestine. This was the great Scythian invasion recorded by Herodotus.[27] We have almost no other report than his few paragraphs, but we can realise the event from our knowledge of the Mongol and Tartar invasions which in later centuries pursued the same path southwards. Living in the saddle, and (it would seem) with no infantry nor chariots to delay them, these Centaurs swept on with a speed of invasion hitherto unknown. In 630 they had crossed the Caucasus, by 626 they were on the borders of Egypt. Psamtik I. succeeded in purchasing their retreat,[28] and they swept back again as swiftly as they came. They must have followed the old Assyrian war-paths of the eighth century, and, without foot-soldiers, had probably kept even more closely to the plains. In Palestine their way would lie, like Assyria’s, across Hauran, through the plain of Esdraelon, and down the Philistine coast, and in fact it is only on this line that there exists any possible trace of them.[29] But they shook the whole of Palestine into consternation. Though Judah among her hills escaped them, as she escaped the earlier campaigns of Assyria, they showed her the penal resources of her offended God. Once again the dark, sacred North was seen to be full of the possibilities of doom. Behold, therefore, exactly the two conditions, ethical and political, which, as we saw, called forth the sudden prophets of the eighth century, and made them so sure of their message of judgment: on the one side Judah, her sins calling aloud for punishment; on the other side the forces of punishment swiftly drawing on. It was precisely at this juncture that prophecy again arose, and as Amos, Hosea, Micah and Isaiah appeared in the end of the eighth century, Zephaniah, Habakkuk, Nahum and Jeremiah appeared in the end of the seventh. The coincidence is exact, and a remarkable confirmation of the truth which we deduced from the experience of Amos, that the assurance of the prophet in Israel arose from the coincidence of his conscience with his political observation. The justice of Jehovah demands His people’s chastisement, but see—the forces of chastisement are already upon the horizon. Zephaniah uses the same phrase as Amos: _the Day of Jehovah_, he says, _is drawing near_. We are now in touch with Zephaniah, the first of our prophets, but, before listening to him, it will be well to complete our survey of those remaining years of the century in which he and his immediate successors laboured. 3. THE REST OF THE CENTURY (625—586): THE FALL OF NINIVEH; NAHUM AND HABAKKUK.