There are many theories about the reforms launched by the Duke Dai of Song, among which there are saying that after several generations of the Song dynasty, the Spirit of the Song people to forge ahead was weakened, and the domestic princes quarreled, and the Zhou royal family continued to decline, resulting in the division of the princely states to govern alone. At that time, the princes did not have much respect for the Zhou royal family, especially after the founding of the State of Zheng, they even made things to steal the wheat of the Zhou royal family and send troops to confront Zhou Tianzi.
At this time, the princely states are no longer the princely states of the past. The State of Qin recovered Qishan, Jin Zheng opened up territory, and the State of Qi attacked the Shandong Peninsula, the Bamboo Book Chronicle says: "The Qi people destroyed Zhu", and the Jin Wen Marquis of the Jin State "then fixed the Heavenly Son", becoming the strongest princely state near the Zhou Kingdom. The era of force and power is coming, and the Zhou Kingdom, which has experienced the loss of virtue of the King of You and the loss of power of the Son of Heaven, has been unable to deter the princes, and the princes have officially declared themselves independent states in a sense.
Song Daigong's reforms, whether it was abolishing public land, reducing the tax burden, or banning alcohol consumption, were all rectification of internal affairs, and contradictions were inside but not outside. Although many achievements were made, Song Daigong forgot the foundation of the chaotic world, that is, strong military combat strength. The reform of the Song state basically did not touch on military reform, which may be related to the cultural genes of the Song people. The Song people were externally subject to the sub-feudal princes of the Zhou royal family, so they could only rely on the development of the economy to strengthen the country. The military capabilities of the Song people at the time of the founding of the country were limited by Zhou Tianzi, and even if he wanted to launch military reforms, it was difficult to achieve success. Later generations of Shang martingale transformation methods, all of which served military operations.
The "Chronicle of History" says: "Thirty-four years, Dai Gong died, and the Ziwu Company was empty. In order to continue the effect of his father Song Daigong's reforms, Duke Wu of Song desperately needed domestic stability, and even relied on political marriage to marry the noble women of the Song Kingdom, Such as Mencius and Shengzi, to the State of Lu and became the favorite of Duke Hui of Lu, of which Son, Shengzi gave birth to the eldest son of Duke Hui of Lu, who was the Duke of Lu. Of course, in fact, Lu Huigong is not a good person, when the King of Zhou Ping allowed the Qin State to sacrifice the ancestors with the Tianzi ceremony, Lu Huigong, as the founder of the Zhou Li, has always been a state of etiquette, mostly the Zhou Tianzi is from, when the Zhou Ping King rewarded the King of Qin, Lu Huigong privately sacrificed himself with the Tianzi ceremony, and the King of ZhouPing dared to be angry and did not dare to speak.
At this time, Qilu can be described as a double male, and the small princely states in the jurisdiction have submitted to it. Lu Huigong sacrificed with the Heavenly Son Ceremony, which shows that he is also a person with considerable ambitions. He married a Song woman as a concubine, and this marriage is very worth exploring. As a country with a foreign surname, the difference in advantages between the Song kingdom and the lu state is very obvious. After the death of Song Daigong, Song Wugong succeeded to the throne, and Song Daigong's reforms must have had a great convenience for the Song State, and trade gradually developed, which also tempted the Di people in the north, coveting the wealth of the Song State, and sending a large army to attack and invade the Song State. The nearest princely power to the Song Dynasty was naturally Qilu and Lu, so the political marriage of the Song DaiGong was still very wise. However, the legacy he left to Song Wugong, in addition to the possibility of huge wealth, there was still a weak military.
According to the history books, this Di people who attacked the Song Kingdom belonged to The Secret, a descendant of the Fengfeng clan, and were said to be tall and quite powerful. The Gong clan of the Song Dynasty led an army to go out, and although it won the victory, it also lost the gong clan's son Situ Huangfu and others. Song Wugong obviously deeply realized the importance of national defense, but national defense did not depend on overnight, in the war with the Di people, the strength of the Song people may be weakened, the best way to strengthen national defense is to rely on external forces. Therefore, Duke Wu of Song married his daughter Zhongzi to Duke Hui of Lu. The history books say: "Duke Wu gave birth to the daughter of Duke Hui of Lu, who gave birth to Duke Huan of Lu. "Significant progress was made in the political marriage of the two generations of monarchs of the Song Dynasty, and two of the three women sent to the Lu State by the Song Wu Duke successively became the favorite concubines of the Lu King. For decades, the State of Lu and the State of Song became a formal strategic alliance.