As soon as morning dawned, the army was put in motion. The charge of the empire, and the keys of the treasury and jewel-chamber were left in the hands of Mílad, with injunctions, however, not to draw a sword against any enemy that might spring up, without the consent and assistance of Zál and Rustem. When the army had arrived within the limits of Mázinderán, Kai-káús ordered Gíw to select two thousand of the bravest men, the boldest wielders of the battle-axe, and proceed rapidly towards the city. In his progress, according to the king's instructions, he burnt and destroyed everything of value, mercilessly slaying man, woman, and child. For the king said:
Kill all before thee, whether young or old, And turn their day to night; thus free the world From the magician's art.
Proceeding in his career of desolation and ruin, Gíw came near to the city, and found it arrayed in all the splendor of heaven; every street was crowded with beautiful women, richly adorned, and young damsels with faces as bright as the moon. The treasure-chamber was full of gold and jewels, and the country abounded with cattle. Information of this discovery was immediately sent to Kai-káús, who was delighted to find that Mázinderán was truly a blessed region, the very garden of beauty, where the cheeks of the women seemed to be tinted with the hue of the pomegranate flower, by the gate-keeper of Paradise.
This invasion filled the heart of the king of Mázinderán with grief and alarm, and his first care was to call the gigantic White Demon to his aid. Meanwhile Kai-káús, full of the wildest anticipations of victory, was encamped on the plain near the city in splendid state, and preparing to commence the final overthrow of the enemy on the following day. In the night, however, a cloud came, and deep darkness like pitch overspread the earth, and tremendous hail-stones poured down upon the Persian host, throwing them into the greatest confusion. Thousands were destroyed, others fled, and were scattered abroad in the gloom. The morning dawned, but it brought no light to the eyes of Kai-káús; and amidst the horrors he experienced, his treasury was captured, and the soldiers of his army either killed or made prisoners of war. Then did he bitterly lament that he had not followed the wise counsel of Zál. Seven days he was involved in this dreadful affliction, and on the eighth day he heard the roar of the White Demon, saying: