As the social structure of the Southern Sung empire had not been changed, the country was not affected by the dynastic development. Only the policy of diplomacy could not be pursued at once, as the Juchên were bellicose at first and would not negotiate. There were therefore several battles at the outset (in 1131 and 1134), in which the Chinese were actually the more successful, but not decisively. The Sung military group was faced as early as in 1131 with furious opposition from the greater gentry, led by Ch'in K'ui, one of the largest landowners of all. His estates were around Nanking, and so in the deployment region and the region from which most of the soldiers had to be drawn for the defensive struggle. Ch'in K'ui secured the assassination of the leader of the military party, General Yo Fei, in 1141, and was able to conclude peace with the Juchên. The Sung had to accept the status of vassals and to pay annual tribute to the Juchên. This was the situation that best pleased the greater gentry. They paid hardly any taxes (in many districts the greater gentry directly owned more than 30 per cent of the land, in addition to which they had indirect interests in the soil), and they were now free from the war peril that ate into their revenues. The tribute amounted only to 500,000 strings of cash. Popular literature, however, to this day represents Ch'in K'ui as a traitor and Yo Fei as a national hero. In 1165 it was agreed between the Sung and the Juchên to regard each other as states with equal rights. It is interesting to note here that in the treaties during the Han time with the Hsiung-nu, the two countries called one another brothers--with the Chinese ruler as the older and thus privileged brother; but the treaties since the T'ang time with northern powers and with Tibetans used the terms father-in-law and son-in-law. The foreign power was the "father-in-law", i.e. the older and, therefore, in a certain way the more privileged; the Chinese were the "son-in-law", the representative of the paternal lineage and, therefore, in another respect also the more privileged! In spite of such agreements with the Juchên, fighting continued, but it was mainly of the character of frontier engagements. Not until 1204 did the military party, led by Han T'o-wei, regain power; it resolved upon an active policy against the north. In preparation for this a military reform was carried out. The campaign proved a disastrous failure, as a result of which large territories in the north were lost. The Sung sued for peace; Han T'o-wei's head was cut off and sent to the Juchên. In this way peace was restored in 1208. The old treaty relationship was now resumed, but the relations between the two states remained tense. Meanwhile the Sung observed with malicious pleasure how the Mongols were growing steadily stronger, first destroying the Hsia state and then aiming the first heavy blows against the Juchên. In the end the Sung