《明史·列传·卷七十一》
敌人进可以获得重利，退也没有后顾之忧，以致战事不断，边患不息。
敌进获重利，退无后忧，致兵锋不靖，边患靡宁。
The enemy could benefit from their advances and didn't have to worry about their retreat, which led to endless wars and border conflicts.