When the messenger returned with this defiant answer, Yong-tsi was very much enraged, and immediately began to prepare for war. Genghis Khan also at once commenced his preparations. He sent envoys to the leading khans who occupied the territories outside the wall inviting them to join him. He raised a great army, and put the several divisions of it under the charge of his ablest generals. Yong-tsi raised a great army too. The historians say that it amounted to three hundred thousand men. He put this army under the command of a great general named Hujaku, and ordered him to advance with it to the northward, so as to intercept the army of Genghis Khan on its way, and to defend the wall and the fortresses on the outside of it from his attacks. In the campaign which ensued Genghis Khan was most successful. The Monguls took possession of a great many towns and fortresses beyond the wall, and every victory that they gained made the tribes and nations that inhabited those provinces more and more disposed to join them. Many of them revolted against the Chinese authority, and turned to their side. One of these was a chieftain so powerful that he commanded an army of one hundred thousand men. In order to bind himself solemnly to the covenant which he was to make with Genghis Khan, he ascended a mountain in company with the envoy and with others who were to witness the proceedings, and there performed the ceremony customary on such occasions. The ceremony consisted of sacrificing a white horse and a black ox, and then breaking an arrow, at the same time pronouncing an oath by which he bound himself under the most solemn sanctions to be faithful to Genghis Khan. To reward the prince for this act of adhesion to his cause, Genghis Khan made him king over all that portion of the country, and caused him to be every where so proclaimed. This encouraged a great many other khans and chieftains to come over to his side; and at length one who had the command of one of the gates of the great wall, and of the fortress which defended it, joined him. By this means Genghis Khan obtained access to the interior of the Chinese dominions, and Yong-tsi and his great general Hujaku became seriously alarmed. At length, after various marchings and counter-marchings, Genghis Khan learned that Hujaku was encamped with the whole of his army in a very strong position at the foot of a mountain, and he determined to proceed thither and attack him. He did so; and the result of the battle was that Hujaku was beaten and was forced to retreat. He retired to a great fortified town, and Genghis Khan followed him and laid siege to the town. Hujaku, finding himself in imminent danger, fled; and Genghis Khan was on the point of taking the town, when he was suddenly stopped in his career by being one day wounded severely by an arrow which was shot at him from the wall.