After all these affairs had been arranged, Genghis Khan put his army in motion. He was obliged, of course, to separate it into several grand divisions, and to send the several divisions forward by different roads, and through different sections of the country. So large a body can never be kept together on a long march, on account of the immense quantity of food that is required, both for the horses and the men, and which must be supplied in the main by the country itself which they traverse, since neither horses nor men can carry food with them for more than a very few days. Genghis Khan put one of the largest divisions under the command of his son Jughi, the prince who distinguished himself so much in the conflicts by which his father raised himself to the supreme power. Jughi was ordered to advance with his division through Turkestan, the country where the Prince Kushluk had sought refuge, and which still remained, in some degree, disaffected toward Genghis Khan. Genghis Khan himself, with the main body of the army, took a more southerly route directly toward the dominions of the sultan. In the mean time the sultan himself had not been idle. He collected together all the forces that he could command. When they were mustered, the number of men was found to be four hundred thousand. This was a large army, though much smaller than that of Genghis Khan. The sultan set out upon his march with his troops to meet the invaders. After advancing for some distance, he learned that the army of Jughi, which had passed through Turkestan, was at the northward of his position, and he found that by turning in that direction he might hope to meet and conquer that part of the Mongul force before it could have time to join the main body. He determined at once to adopt this plan. He accordingly turned his course, and marched forward into the part of the country where he supposed Jughi to be. At length he came to a place where his scouts found, near a river, a great many dead bodies lying on the ground. Among the others who had fallen there was one man who was wounded, but was not dead. This wounded man told the scouts that the bodies were those of persons who had been slain by the army of Jughi, which had just passed that way. The sultan accordingly pressed forward and soon overtook them. Jughi was hastening on in order to join his father. Jughi consulted his generals in respect to what it was best to do. They advised him to avoid a battle. "We are not strong enough," said they, "to encounter alone the whole of the sultan's army. It is better that we should retreat, which we can do in an orderly manner, and thus join the main body before we give the enemy battle. Or, if the sultan should attempt to pursue us, he can not keep his army together in doing so. They will necessarily become divided into detachments on the road, and then we can turn and destroy them in detail, which will be a much surer mode of proceeding than for us to attack them in the mass."