The third squad, which was assigned to Hwanghae Province at the Hancheng (Seoul) meeting in mid-June, chased Sonjo, the King of the Yi Dynasty (Korea), with the first squad assigned to Pyeongan Province, subsequently conquered Kaesong and reached Pyongyang.
5月初旬の漢城会議で黄海道を担当することとなった三番隊は平安道担当の一番隊と共に李氏朝鮮王の宣祖を追って開城を攻略し、平壌まで進んだ。