In the autumn of 503 BC, the Duke of Qi Jing and the Zheng Xian Guild allied with each other, seeking to replace the Jin state as an ally. Because the State of Lu did not join the alliance of Qi and Zheng, the Qi army attacked the State of Lu. The Lu army fought, and Yang Hu wanted to use the Qi army to eliminate Ji Huanzi and Meng Yizi, but it was unsuccessful.
![The three famous yang plots in history knew that they were traps but had to jump, and no one could solve them for thousands of years[fig]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)