…Emperor Taiwu makes another attack on Tongwan.…
427 CE
…Emperor Taiwu makes another attack on Tongwan.
Helian Chang initially takes Helian Ding's suggestion to try to defend Tongwan until he can defeat Daxi, but misinformation that Helian Chang receives then induces him to come out of Tongwan to engage Northern Wei forces.
Emperor Taiwu defeats him in battle, causing him to be unable to return to Tongwan and forcing him to flee to Shanggui (in modern Tianshui, Gansu), allowing Emperor Taiwu to capture Tongwan.
In the first of what is to be a string of marriages that could be characterized as either political or self-aggrandizing, he takes three of Helian Bobo's daughters as his concubines.
Upon hearing of Tongwan's fall, Helian Ding disengages from Daxi and joins Helian Chang at Shanggui as well.