The Longest Day In Chang'An

Birth Of Yin (1x34)

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Rebel fighters pretend to be craftsmen, Zhang Luo smells a rat and decides to check things out, only to be pushed into the river by them. The craftsman studies the fragments from Zhang Xiaojing closely and comes to the conclusion that they are from bamboo sticks used to build the Heavenly Lantern Tower, and that Long Bo could fill them with stone grease and make the Lantern Tower a 50-metre explosive. If detonated, it would instantly destroy everything within a few kilometres.