From hinterland granary fort to frontier mountain fortress: Initiation, construction, and expansion of the Diaoyucheng Fortress, Hechuan, China, in the wars during 1125–1279 by Wen Huang, Jiang Feng

“…The Southern Song planned and constructed the Diaoyucheng Fortress at Hezhou of the Sichuan Theatre, during the 13th century. This fortress became famous for its 36-year resistance against the Mongols and the death of Möngke Khan in 1259. …”
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