While this passed, so did the time. It was now nearly eleven o'clock. Suddenly the whole black line which seemed to be zeriba began to move. It was made of men, not bushes. Behind it other immense masses and lines of men appeared over the crest; and while we watched, amazed by the wonder of the sight, the whole face of the slope became black with swarming savages. Four miles from end to end, and, as it seemed, in five great divisions, this mighty army advanced--swiftly. The whole side of the hill seemed to move. Between the masses horsemen galloped continually; before them many patrols dotted the plain; above them waved hundreds of banners, and the sun, glinting on many thousand hostile spear-points, spread a sparkling cloud. It is now known that the Khalifa had succeeded in concentrating at Omdurman an army of more than 60,000 men. He remembered that all the former victories over the Egyptians had been won by the Dervishes attacking. He knew that in all the recent defeats they had stood on the defensive. He therefore determined not to oppose the advance at the Shabluka or on the march thence to Omdurman. All was to be staked on the issue of a great battle on the plains of Kerreri. The Mahdi's prophecy was propitious. The strength of the Dervish army seemed overwhelming. When the 'Turks' arrived, they should be driven into the river. Accordingly the Khalifa had only watched the advance of the Expeditionary Force from Wad Hamed with a patrol of cavalry about 200 strong. On the 30th he was informed that the enemy drew near, and on the 31st he assembled his bodyguard and regular army, with the exception of the men needed for the river batteries, on the Omdurman parade ground. He harangued the leaders; and remained encamped with his troops during the night. The next day all the male population of the city were compelled to join the army in the field, and only the gunners and garrisons on the river-face remained within. In spite, however, of his utmost vigilance, nearly 6,000 men deserted during the nights of the 31st of August and the 1st of September. This and the detachments in the forts reduced the force actually engaged in the battle to 52,000 men. The host that now advanced towards the British and Egyptian cavalry was perhaps 4,000 stronger.