Yet there was poison in the victor's cup of joy. His brothers envied him, intrigued against him, and succeeded in instilling such doubts in the emperor's mind that Lichimin fell into disgrace and was strongly tempted to leave the court. The intrigues, which had first dealt with his good name, were next directed against his life, a plot to murder him being devised. Fortunately it was discovered in time, and the death they had planned for their brother fell upon themselves, leaving him the emperor's unquestioned heir. The same year (626 A.D.) the emperor retired to private life and raised his great son to the throne. Lichimin, as emperor, assumed the name of Taitsong, a title which he made so famous that he fully earned the designation of Taitsong the Great. The empire was surrounded with enemies, the nomads of the north, extending from Corea to Kokonor, and the warlike people of the south, from Thibet to Tonquin. During the remainder of his life he was engaged in incessant conflict with these stinging wasps, whose onslaughts left him no peace. Scarcely was he settled on the throne when the Tartar invasions began. Their raids were repelled, but they instigated Taitsong to an important measure. It had always been evident that the Chinese troops, hitherto little more than a raw militia, were unable to cope with the sons of the desert, and the shrewd emperor set himself to organize an army that should be a match in discipline and effectiveness for any of its foes. The new army embraced three ranks, each corps of the superior rank consisting of twelve hundred, and those of the others respectively of one thousand and eight hundred men. The total force thus organized approached nine hundred thousand men, of whom a large portion were used for frontier duty. These troops were carefully trained in the use of the bow and the pike, Taitsong himself inspecting a portion of them daily. This innovation roused bitter opposition from the literati, whose books told them that former emperors did not engage in such work. But Taitsong, on the theory that in time of peace we should prepare for war, went on with his reforms regardless of their cited precedents. Taitsong's new army was soon put to the proof. The Tartars were in arms again, a powerful confederacy had been formed, and China was in danger. Marching into the desert with his disciplined forces, he soon had his enemies in flight, forced several of the leading khans to submit, and spread the dread of his arms widely among the tribes. To his title of Emperor of China he now added that of Khan of the Tartars, and claimed as subjects all the nomads of the desert.