Kublai Khan had already learned that Möngke Khan had died in the Battle of Diaoyu City, so why did he lead an army to attack the Southern Song Dynasty? I. Kublai Khan asked Song II, Möngke Khan to die suddenly in DiaoyuChengxia III, Kublai Khan to decisively cross the river IV, and Kublai Khan to withdraw his troops under Ezhou City

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