Ryonggol Fortress Pihyon-gun/Yomju-gun 룡골산성 竜骨山城 63 Cholong Castle Yongbyon 철옹성 鐵瓮城 64 Inpung Pavilion Chungsong-dong, Kanggye 인풍루 仁風樓 65 Mangmi Pavilion Pukchang-dong...

《国榷》卷九十、《明季北略》卷五：崇祯二年十一月二十日，宣府总兵侯世禄、大同总兵满桂屯兵德胜门，与后金军交战，城上守军发炮助战，误中满桂所部将士，满桂本人也负伤，率残兵百余人退入德胜门瓮城。>《国榷》卷一百、《流寇长编》卷十七、《甲申纪事》：崇祯十七年三月十七、十八两日，李自成军冒雨猛攻北京内城，城上守军惧且怨，乃施放空炮，炮内未装铅子，借以敷衍塞责。...

often placed in front of the main gatehouse, forming a barbican (Chinese: 瓮城; pinyin: wèngchéng). In its final form during the Ming and Qing dynasties...