@historywatcher: For six years, the twin fortress cities of Xiangyang and Fancheng stood between the Mongol Empire and southern China. Protected by strong walls and supplied through the Han River, they seemed impossible to conquer. But new siege technology and relentless determination would break the last great defensive line of the Song Dynasty. #BattleOfXiangyang #MongolEmpire #ChineseHistory #MilitaryHistory #HistoryShorts #WarHistory #KublaiKhan #SongDynasty #SiegeWarfare #AncientChina