When Wei forces encountered Song young men, the forces quickly beheaded them or cut them in half. The infants were pierced through with spears, and the spears were then shaken so that the infants would scream as they were spun, for entertainment. The commanderies and counties that Wei forces went through were burned and slaughtered, and not even grass was left. When sparrows returned in the spring, they could not find houses to build nest on, so they had to do so in forests. Wei soldiers and horses also suffered casualties of more than half, and the Xianbei people were all complaining. Another part of Emperor Taiwu's personality that was revealed as how, even as the states were engaging wars, he was maintaining formal protocols of détente. For example, when he was outside of Pengcheng, he requested Liu Jun supply him with wine and sugarcanes, while offering Liu Jun a gift of camels, mules, and coats. Later, he requested oranges and gambling supplies from Liu Jun, while offering Liu Jun blankets, salts, and pickled beans. Similar things happened as he was at Guabu, as he requested and sent gifts to and from Emperor Wen. (How Zang aggravated him was by sending him urine when he requested wine, thus breaking the pattern of formal exchanges of gifts.) In 451, there would be further political turmoil, with Crown Prince Huang and his associates being the victims. Crown Prince Huang had been considered able and all-seeing, but overly trusting of his associates, while privately managing farms and orchards and receiving profits from them. Crown Prince Huang greatly disliked the eunuch Zong Ai, and Zong decided to act first, accusing Crown Prince Huang's associates Chou'ni Daosheng (仇泥道盛) and Ren Pingcheng (任平城) of crimes, and Chou'ni and Ren were executed. Further, many other associates of Crown Prince Huang were dragged into the incident and executed. Crown Prince Huang himself grew ill in anxiety, and died in summer 451. Soon, however, Emperor Taiwu found out that Crown Prince Huang was not guilty, and became heavily regretful of his actions in pursuing the crown prince's associates. He did not create a new crown prince, although he briefly created Crown Prince Huang's son Tuoba Jun the Prince of Gaoyang—but then cancelled that creation, figuring that the heir of the crown prince should not be created a mere imperial prince, suggesting that he intended for Tuoba Jun to inherit