Why did Emperor Chongzhen not allow Joseon to submit to the Great Ming? And why did he not immediately send troops to Joseon to launch a pincer attack on the Jiannu?
It was because he wanted to leave the Jiannu a way out.
Why leave them a way out? Because he intended to destroy their lair and wipe out their entire race. Regardless of whether one analyzed it from the perspective of military strength or national power, the failure of the Jiannu was only a matter of time.
Chapter 1157