What tactics did Hanoi's valiant generals use to transfer their own people to Hedong?

It is not a special sentence pattern, but a causative usage.

When there was a famine in Hanoi (place name), I moved the people there to Hedong and transported the food from Hedong to Hanoi. It is said that Liang's rule of the country is that "if Hanoi is fierce, it will immigrate to Hedong, and its millet will move to Hanoi, and Hedong will be fierce." The word "people" in this sentence should be understood as "young people". Zhu explained it this way: "Immigrants can eat whatever they want, and move millet to those who can't move it." Zhu's explanation focuses on the left-behind young and old, noting that young and old can't walk around. If it is really for disaster relief, there is no need to emigrate, which involves many factors of social stability such as family ethics. This is why Mencius said that Liang's policy was "pot calling the kettle black".

From my own country, it is about Liang's way of governing the country. "If Hanoi is fierce, it will move its people to Hedong, and its millet will be in Hanoi." The word "people" in this sentence should be understood as "young people". Zhu explained it this way: "Immigrants can eat whatever they want, and move millet to those who can't move it." Zhu's explanation focuses on the left-behind young and old, noting that young and old can't walk around. If it is really for disaster relief, there is no need to emigrate, which involves many factors of social stability such as family ethics. This is why Mencius said that Liang's policy was "pot calling the kettle black" and did not play a fundamental role.