A module about mongols conquest period, majorly focus on those Chinese ancient separatist dynasties like Song, Jin, Xia, Liao, Dali which fight against mongols, along with some middle and western regimes which conquered by mongols like Khwarazm, Hungary etc.
An update on a whim, commemorating the Xi 'an Incident (12th Dec.), which promote the whole China to the Chinese united front against Japanese aggression.