Joseon general Im Gyeong Eop, who was in charge of defending the Baengma fortress on the Qing-Joseon border, made his way down to Hanseong and ambushed a group of Qing soldiers making their return home, beheading its general Yaochui (要槌, nephew of Hong Taiji) in the process. As he was not aware of the surrender at the time, he was let go without any punishment by Hong Taiji who was greatly impressed by Im's courageous efforts on behalf of his kingdom. Im had requested military support from Hanseong at the beginning of the war (which never came) and planned to invade Mukden himself.