What does the garrison policy of the Han Dynasty mean?

The Han Dynasty's border garrison policy meant that the government moved some farmers to the border areas and established military strongholds there to carry out agricultural development and defense work in border areas. These military strongholds for garrisoning fields and guarding borders are usually ruled by the army and are responsible for both military defense and agricultural production. This policy aimed to strengthen the Han Dynasty's control in border areas, curb foreign invasion, and at the same time improve the level of economic development in border areas. In addition, the Han Dynasty's border garrison policy was also conducive to quelling civil unrest, controlling local forces, and strengthening centralization.