In 1618 the Manchus crossed their southern frontier and boldly set foot on the soil of China, their movement being so sudden and unexpected that the border town of Fooshun was taken almost without a blow. The army sent to retake it was hurled back in defeat, and the strong town of Tsingho was next besieged and captured. The progress of Noorhachu was checked at this point by the clamor of his men, who were unwilling to march farther while leaving the hostile state of Yeho in their rear. He therefore led them back to their homes. The Chinese were now thoroughly aroused. An army of more than one hundred thousand men was raised and sent to attack Noorhachu in his native realm. But it was weakly commanded and unwisely divided into three unsupported sections, which the Manchus attacked and routed in detail. The year's work was completed by the conquest and annexation of Yeho, an event which added thirty thousand men to Noorhachu's resources and completed the confederation of the Niuche clans, which had been his original plan. The old Chinese emperor was now near his life's end. But his last act was one of his wisest ones, it being the appointment of Tingbi, a leader of skill and resolution, to the command in Liautung. In a brief time this energetic commander had placed the capital and the border towns of the province in a state of defence and collected an army of one hundred and eighty thousand men on the frontier. Two years sufficed to make the province impregnable to Manchu attack. During this period of energy Noorhachu wisely remained quiet. But the Chinese emperor died, and was succeeded by his son, who quickly followed him to the grave. His grandson, a boy of sixteen, succeeded, and the court enemies of Tingbi now had him recalled and replaced by a man who had never seen a battle. The result was what might have been expected. Noorhachu, who had been waiting his opportunity, at once led his army across the borders (1621), marching upon the strong town of Moukden, whose commandant, more brave than wise, left the shelter of his walls to meet him in the field. The result was a severe repulse, the Manchus entering the gates with the fugitives and slaughtering the garrison in the streets. Three armies were sent to retake Moukden, but were so vigorously dealt with that in a few weeks less than half Tingbi's strong army remained. Liauyang, the capital of the province, was next besieged and taken by storm, the garrison falling almost to a man, among them Tingbi's incapable successor meeting his death. No further resistance was made, the other towns, with one exception, opened their gates, and in a brief time Noorhachu completed the conquest of the province of Liautung.