In spite of this, the Chin troops succeeded in overthrowing the second southern state, that of Wu (A.D. 280), and in so restoring the unity of the empire, the Shu Han realm having been already conquered by the Wei. After the destruction of Wu there remained no external enemy that represented a potential danger, so that a general disarmament was decreed (280) in order to restore a healthy economic and financial situation. This disarmament applied, of course, to the troops directly under the orders of the dynasty, namely the troops of the court and the capital and the imperial troops in the provinces. Disarmament could not, however, be carried out in the princes' regions, as the princes declared that they needed personal guards. The dismissal of the troops was accompanied by a decree ordering the surrender of arms. It may be assumed that the government proposed to mint money with the metal of the weapons surrendered, for coin (the old coin of the Wei dynasty) had become very scarce; as we indicated previously, money had largely been replaced by goods so that, for instance, grain and silks were used for the payment of salaries. China, from _c_. 200 A.D. on until the eighth century, remained in a period of such partial "natural economy". Naturally the decree for the surrender of weapons remained a dead-letter. The discharged soldiers kept their weapons at first and then preferred to sell them. A large part of them was acquired by the Hsiung-nu and the Hsien-pi in the north of China; apparently they usually gave up land in return. In this way many Chinese soldiers, though not all by any means, went as peasants to the regions in the north of China and beyond the frontier. They were glad to do so, for the Hsiung-nu and the Hsien-pi had not the efficient administration and rigid tax collection of the Chinese; and above all, they had no great landowners who could have organized the collection of taxes. For their part, the Hsiung-nu and the Hsien-pi had no reason to regret this immigration of peasants, who could provide them with the farm produce they needed. And at the same time they were receiving from them large quantities of the most modern weapons. This ineffective disarmament was undoubtedly the most pregnant event of the period of the western Chin dynasty. The measure was intended to save the cost of maintaining the soldiers and to bring them back to the land as peasants (and taxpayers); but the discharged men were not given land by the government. The disarmament achieved nothing, not even the desired increase in the money in circulation; what did happen was that the central government lost all practical power, while the military strength both of the dangerous princes within the country and also of the frontier people was increased. The results of these mistaken measures became evident at once and compelled the government to arm anew. 2 _Effect on the frontier peoples_