First, away from the right and wrong places, the bustling areas are the places that the winners should occupy first, and these places have become the cusp of the military strategists. In the situation of a mountain defeat, they can only choose strategic shift.
Second, the remote areas are sparsely populated and the information is blocked, which will not be greatly affected by the unfavorable factors of the frontal battlefield, which is convenient for the fugitive regime to gather people's hearts in a short time and quickly take the initiative among the people in some areas.
Third, the embarrassing situation of being attacked between Scylla and Charybdis was avoided to the maximum extent, which can be proved by Nanming, Southern Song Dynasty and fugitive Tang Xuanzong.