The Emperor of China, in pursuing his measures of defense, had ordered all the men capable of bearing arms in the villages and in the open country to repair to the nearest large city or fortress, there to be enrolled and equipped for service. The consequence was that the Monguls found in many places, as they advanced through the country, nobody but infirm old men, and women and children in the hamlets and villages. A great many of these, especially such as seemed to be of most consequence, the handsomest and best of the women, and the oldest children, they seized and took with them in continuing their march, intending to make slaves of them. They also took possession of all the gold and silver, and also of all the silks and other rich and valuable merchandise which they found, and distributed it as plunder. The spoil which they obtained, too, in sheep and cattle, was enormous. From it they made up immense flocks and herds, which were driven off into the Mongul country. The rest were slaughtered, and used to supply the army with food. It was the custom of the invaders, after having pillaged a town and its environs, and taken away all which they could convert to any useful purpose for themselves, to burn the town itself, and then to march on, leaving in the place only a smoking heap of ruins, with the miserable remnant of the population which they had spared wandering about the scene of desolation in misery and despair. They made a most cowardly and atrocious use, too, of the prisoners whom they conveyed away. When they arrived at a fortified town where there was a garrison or any other armed force prepared to resist them, they would bring forward these helpless captives, and put them in the fore-front of the battle in such a manner that the men on the walls could not shoot their arrows at their savage assailants without killing their own wives and children. The officers commanded the men to fire notwithstanding. But they were so moved by the piteous cries which the women and children made that they could not bear to do it, and so they refused to obey, and in the excitement and confusion thus produced the Monguls easily obtained possession of the town. There are two great rivers in China, both of which flow from west to east, and they are at such a distance from each other and from the frontiers that they divide the territory into three nearly equal parts. The northernmost of these rivers is the Hoang Ho. The Monguls in the course of two years overran and made themselves masters of almost the whole country lying north of this river, that is, of about one third of China proper. There were, however, some strongly-fortified towns which they found it very difficult to conquer.